<?php
namespace TYPO3\CMS\Core\Tests\Unit\Utility;

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

use org\bovigo\vfs\vfsStream;
use org\bovigo\vfs\vfsStreamDirectory;
use org\bovigo\vfs\vfsStreamWrapper;
use TYPO3\CMS\Core\Package\Package;
use TYPO3\CMS\Core\Package\PackageManager;
use TYPO3\CMS\Core\Tests\Unit\Utility\AccessibleProxies\ExtensionManagementUtilityAccessibleProxy;
use TYPO3\CMS\Core\Tests\Unit\Utility\Fixtures\GeneralUtilityFilesystemFixture;
use TYPO3\CMS\Core\Tests\Unit\Utility\Fixtures\GeneralUtilityFixture;
use TYPO3\CMS\Core\Tests\Unit\Utility\Fixtures\GeneralUtilityMinifyJavaScriptFixture;
use TYPO3\CMS\Core\Tests\Unit\Utility\Fixtures\OriginalClassFixture;
use TYPO3\CMS\Core\Tests\Unit\Utility\Fixtures\OtherReplacementClassFixture;
use TYPO3\CMS\Core\Tests\Unit\Utility\Fixtures\ReplacementClassFixture;
use TYPO3\CMS\Core\Tests\Unit\Utility\Fixtures\TwoParametersConstructorFixture;
use TYPO3\CMS\Core\Utility\ExtensionManagementUtility;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\TestingFramework\Core\FileStreamWrapper;

/**
 * Testcase for class \TYPO3\CMS\Core\Utility\GeneralUtility
 */
class GeneralUtilityTest extends \TYPO3\TestingFramework\Core\Unit\UnitTestCase
{
    const NO_FIX_PERMISSIONS_ON_WINDOWS = 'fixPermissions() not available on Windows (method does nothing)';
    /**
     * @var array A backup of registered singleton instances
     */
    protected $singletonInstances = [];

    /**
     * @var \TYPO3\CMS\Core\Package\PackageManager
     */
    protected $backupPackageManager;

    /**
     * Set up
     */
    protected function setUp()
    {
        GeneralUtilityFixture::flushInternalRuntimeCaches();
        GeneralUtilityFixture::$isAllowedHostHeaderValueCallCount = 0;
        GeneralUtilityFixture::setAllowHostHeaderValue(false);
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['trustedHostsPattern'] = GeneralUtility::ENV_TRUSTED_HOSTS_PATTERN_ALLOW_ALL;
        $this->singletonInstances = GeneralUtility::getSingletonInstances();
        $this->backupPackageManager = ExtensionManagementUtilityAccessibleProxy::getPackageManager();
    }

    /**
     * Tear down
     */
    protected function tearDown()
    {
        GeneralUtility::resetSingletonInstances($this->singletonInstances);
        ExtensionManagementUtilityAccessibleProxy::setPackageManager($this->backupPackageManager);
        parent::tearDown();
    }

    /**
     * Helper method to test for an existing internet connection.
     * Some tests are skipped if there is no working uplink.
     *
     * @return bool $isConnected
     */
    public function isConnected()
    {
        $isConnected = false;
        $connected = @fsockopen('typo3.org', 80);
        if ($connected) {
            $isConnected = true;
            fclose($connected);
        }
        return $isConnected;
    }

    /**
     * Helper method to create a random directory in the virtual file system
     * and return the path.
     *
     * @param string $prefix
     * @return string
     */
    protected function getVirtualTestDir($prefix = 'root_')
    {
        $root = vfsStream::setup();
        $path = $root->url() . '/typo3temp/var/tests/' . $this->getUniqueId($prefix);
        GeneralUtility::mkdir_deep($path);
        return $path;
    }

    ///////////////////////////
    // Tests concerning _GP
    ///////////////////////////
    /**
     * @test
     * @dataProvider gpDataProvider
     */
    public function canRetrieveValueWithGP($key, $get, $post, $expected)
    {
        $_GET = $get;
        $_POST = $post;
        $this->assertSame($expected, GeneralUtility::_GP($key));
    }

    /**
     * Data provider for canRetrieveValueWithGP.
     * All test values also check whether slashes are stripped properly.
     *
     * @return array
     */
    public function gpDataProvider()
    {
        return [
            'No key parameter' => [null, [], [], null],
            'Key not found' => ['cake', [], [], null],
            'Value only in GET' => ['cake', ['cake' => 'li\\e'], [], 'li\\e'],
            'Value only in POST' => ['cake', [], ['cake' => 'l\\ie'], 'l\\ie'],
            'Value from POST preferred over GET' => ['cake', ['cake' => 'is a'], ['cake' => '\\lie'], '\\lie'],
            'Value can be an array' => [
                'cake',
                ['cake' => ['is a' => 'l\\ie']],
                [],
                ['is a' => 'l\\ie']
            ]
        ];
    }

    ///////////////////////////
    // Tests concerning _GPmerged
    ///////////////////////////
    /**
     * @test
     * @dataProvider gpMergedDataProvider
     */
    public function gpMergedWillMergeArraysFromGetAndPost($get, $post, $expected)
    {
        $_POST = $post;
        $_GET = $get;
        $this->assertEquals($expected, GeneralUtility::_GPmerged('cake'));
    }

    /**
     * Data provider for gpMergedWillMergeArraysFromGetAndPost
     *
     * @return array
     */
    public function gpMergedDataProvider()
    {
        $fullDataArray = ['cake' => ['a' => 'is a', 'b' => 'lie']];
        $postPartData = ['cake' => ['b' => 'lie']];
        $getPartData = ['cake' => ['a' => 'is a']];
        $getPartDataModified = ['cake' => ['a' => 'is not a']];
        return [
            'Key doesn\' exist' => [['foo'], ['bar'], []],
            'No POST data' => [$fullDataArray, [], $fullDataArray['cake']],
            'No GET data' => [[], $fullDataArray, $fullDataArray['cake']],
            'POST and GET are merged' => [$getPartData, $postPartData, $fullDataArray['cake']],
            'POST is preferred over GET' => [$getPartDataModified, $fullDataArray, $fullDataArray['cake']]
        ];
    }

    ///////////////////////////////
    // Tests concerning _GET / _POST
    ///////////////////////////////
    /**
     * Data provider for canRetrieveGlobalInputsThroughGet
     * and canRetrieveGlobalInputsThroughPost
     *
     * @return array
     */
    public function getAndPostDataProvider()
    {
        return [
            'Requested input data doesn\'t exist' => ['cake', [], null],
            'No key will return entire input data' => [null, ['cake' => 'l\\ie'], ['cake' => 'l\\ie']],
            'Can retrieve specific input' => ['cake', ['cake' => 'l\\ie', 'foo'], 'l\\ie'],
            'Can retrieve nested input data' => ['cake', ['cake' => ['is a' => 'l\\ie']], ['is a' => 'l\\ie']]
        ];
    }

    /**
     * @test
     * @dataProvider getAndPostDataProvider
     */
    public function canRetrieveGlobalInputsThroughGet($key, $get, $expected)
    {
        $_GET = $get;
        $this->assertSame($expected, GeneralUtility::_GET($key));
    }

    /**
     * @test
     * @dataProvider getAndPostDataProvider
     */
    public function canRetrieveGlobalInputsThroughPost($key, $post, $expected)
    {
        $_POST = $post;
        $this->assertSame($expected, GeneralUtility::_POST($key));
    }

    ///////////////////////////////
    // Tests concerning _GETset
    ///////////////////////////////
    /**
     * @test
     * @dataProvider getSetDataProvider
     */
    public function canSetNewGetInputValues($input, $key, $expected, $getPreset = [])
    {
        $_GET = $getPreset;
        GeneralUtility::_GETset($input, $key);
        $this->assertSame($expected, $_GET);
    }

    /**
     * Data provider for canSetNewGetInputValues
     *
     * @return array
     */
    public function getSetDataProvider()
    {
        return [
            'No input data used without target key' => [null, null, []],
            'No input data used with target key' => ['', 'cake', ['cake' => '']],
            'No target key used with string input data' => ['data', null, []],
            'No target key used with array input data' => [['cake' => 'lie'], null, ['cake' => 'lie']],
            'Target key and string input data' => ['lie', 'cake', ['cake' => 'lie']],
            'Replace existing GET data' => ['lie', 'cake', ['cake' => 'lie'], ['cake' => 'is a lie']],
            'Target key pointing to sublevels and string input data' => ['lie', 'cake|is', ['cake' => ['is' => 'lie']]],
            'Target key pointing to sublevels and array input data' => [['a' => 'lie'], 'cake|is', ['cake' => ['is' => ['a' => 'lie']]]]
        ];
    }

    ///////////////////////////
    // Tests concerning cmpIPv4
    ///////////////////////////
    /**
     * Data provider for cmpIPv4ReturnsTrueForMatchingAddress
     *
     * @return array Data sets
     */
    public static function cmpIPv4DataProviderMatching()
    {
        return [
            'host with full IP address' => ['127.0.0.1', '127.0.0.1'],
            'host with two wildcards at the end' => ['127.0.0.1', '127.0.*.*'],
            'host with wildcard at third octet' => ['127.0.0.1', '127.0.*.1'],
            'host with wildcard at second octet' => ['127.0.0.1', '127.*.0.1'],
            '/8 subnet' => ['127.0.0.1', '127.1.1.1/8'],
            '/32 subnet (match only name)' => ['127.0.0.1', '127.0.0.1/32'],
            '/30 subnet' => ['10.10.3.1', '10.10.3.3/30'],
            'host with wildcard in list with IPv4/IPv6 addresses' => ['192.168.1.1', '127.0.0.1, 1234:5678::/126, 192.168.*'],
            'host in list with IPv4/IPv6 addresses' => ['192.168.1.1', '::1, 1234:5678::/126, 192.168.1.1'],
        ];
    }

    /**
     * @test
     * @dataProvider cmpIPv4DataProviderMatching
     */
    public function cmpIPv4ReturnsTrueForMatchingAddress($ip, $list)
    {
        $this->assertTrue(GeneralUtility::cmpIPv4($ip, $list));
    }

    /**
     * Data provider for cmpIPv4ReturnsFalseForNotMatchingAddress
     *
     * @return array Data sets
     */
    public static function cmpIPv4DataProviderNotMatching()
    {
        return [
            'single host' => ['127.0.0.1', '127.0.0.2'],
            'single host with wildcard' => ['127.0.0.1', '127.*.1.1'],
            'single host with /32 subnet mask' => ['127.0.0.1', '127.0.0.2/32'],
            '/31 subnet' => ['127.0.0.1', '127.0.0.2/31'],
            'list with IPv4/IPv6 addresses' => ['127.0.0.1', '10.0.2.3, 192.168.1.1, ::1'],
            'list with only IPv6 addresses' => ['10.20.30.40', '::1, 1234:5678::/127']
        ];
    }

    /**
     * @test
     * @dataProvider cmpIPv4DataProviderNotMatching
     */
    public function cmpIPv4ReturnsFalseForNotMatchingAddress($ip, $list)
    {
        $this->assertFalse(GeneralUtility::cmpIPv4($ip, $list));
    }

    ///////////////////////////
    // Tests concerning cmpIPv6
    ///////////////////////////
    /**
     * Data provider for cmpIPv6ReturnsTrueForMatchingAddress
     *
     * @return array Data sets
     */
    public static function cmpIPv6DataProviderMatching()
    {
        return [
            'empty address' => ['::', '::'],
            'empty with netmask in list' => ['::', '::/0'],
            'empty with netmask 0 and host-bits set in list' => ['::', '::123/0'],
            'localhost' => ['::1', '::1'],
            'localhost with leading zero blocks' => ['::1', '0:0::1'],
            'host with submask /128' => ['::1', '0:0::1/128'],
            '/16 subnet' => ['1234::1', '1234:5678::/16'],
            '/126 subnet' => ['1234:5678::3', '1234:5678::/126'],
            '/126 subnet with host-bits in list set' => ['1234:5678::3', '1234:5678::2/126'],
            'list with IPv4/IPv6 addresses' => ['1234:5678::3', '::1, 127.0.0.1, 1234:5678::/126, 192.168.1.1']
        ];
    }

    /**
     * @test
     * @dataProvider cmpIPv6DataProviderMatching
     */
    public function cmpIPv6ReturnsTrueForMatchingAddress($ip, $list)
    {
        $this->assertTrue(GeneralUtility::cmpIPv6($ip, $list));
    }

    /**
     * Data provider for cmpIPv6ReturnsFalseForNotMatchingAddress
     *
     * @return array Data sets
     */
    public static function cmpIPv6DataProviderNotMatching()
    {
        return [
            'empty against localhost' => ['::', '::1'],
            'empty against localhost with /128 netmask' => ['::', '::1/128'],
            'localhost against different host' => ['::1', '::2'],
            'localhost against host with prior bits set' => ['::1', '::1:1'],
            'host against different /17 subnet' => ['1234::1', '1234:f678::/17'],
            'host against different /127 subnet' => ['1234:5678::3', '1234:5678::/127'],
            'host against IPv4 address list' => ['1234:5678::3', '127.0.0.1, 192.168.1.1'],
            'host against mixed list with IPv6 host in different subnet' => ['1234:5678::3', '::1, 1234:5678::/127']
        ];
    }

    /**
     * @test
     * @dataProvider cmpIPv6DataProviderNotMatching
     */
    public function cmpIPv6ReturnsFalseForNotMatchingAddress($ip, $list)
    {
        $this->assertFalse(GeneralUtility::cmpIPv6($ip, $list));
    }

    ///////////////////////////////
    // Tests concerning IPv6Hex2Bin
    ///////////////////////////////
    /**
     * Data provider for IPv6Hex2BinCorrect
     *
     * @return array Data sets
     */
    public static function IPv6Hex2BinDataProviderCorrect()
    {
        return [
            'empty 1' => ['::', str_pad('', 16, "\x00")],
            'empty 2, already normalized' => ['0000:0000:0000:0000:0000:0000:0000:0000', str_pad('', 16, "\x00")],
            'already normalized' => ['0102:0304:0000:0000:0000:0000:0506:0078', "\x01\x02\x03\x04" . str_pad('', 8, "\x00") . "\x05\x06\x00\x78"],
            'expansion in middle 1' => ['1::2', "\x00\x01" . str_pad('', 12, "\x00") . "\x00\x02"],
            'expansion in middle 2' => ['beef::fefa', "\xbe\xef" . str_pad('', 12, "\x00") . "\xfe\xfa"],
        ];
    }

    /**
     * @test
     * @dataProvider IPv6Hex2BinDataProviderCorrect
     */
    public function IPv6Hex2BinCorrectlyConvertsAddresses($hex, $binary)
    {
        $this->assertTrue(GeneralUtility::IPv6Hex2Bin($hex) === $binary);
    }

    ///////////////////////////////
    // Tests concerning IPv6Bin2Hex
    ///////////////////////////////
    /**
     * Data provider for IPv6Bin2HexCorrect
     *
     * @return array Data sets
     */
    public static function IPv6Bin2HexDataProviderCorrect()
    {
        return [
            'empty' => [str_pad('', 16, "\x00"), '::'],
            'non-empty front' => ["\x01" . str_pad('', 15, "\x00"), '100::'],
            'non-empty back' => [str_pad('', 15, "\x00") . "\x01", '::1'],
            'normalized' => ["\x01\x02\x03\x04" . str_pad('', 8, "\x00") . "\x05\x06\x00\x78", '102:304::506:78'],
            'expansion in middle 1' => ["\x00\x01" . str_pad('', 12, "\x00") . "\x00\x02", '1::2'],
            'expansion in middle 2' => ["\xbe\xef" . str_pad('', 12, "\x00") . "\xfe\xfa", 'beef::fefa'],
        ];
    }

    /**
     * @test
     * @dataProvider IPv6Bin2HexDataProviderCorrect
     */
    public function IPv6Bin2HexCorrectlyConvertsAddresses($binary, $hex)
    {
        $this->assertEquals(GeneralUtility::IPv6Bin2Hex($binary), $hex);
    }

    ////////////////////////////////////////////////
    // Tests concerning normalizeIPv6 / compressIPv6
    ////////////////////////////////////////////////
    /**
     * Data provider for normalizeIPv6ReturnsCorrectlyNormalizedFormat
     *
     * @return array Data sets
     */
    public static function normalizeCompressIPv6DataProviderCorrect()
    {
        return [
            'empty' => ['::', '0000:0000:0000:0000:0000:0000:0000:0000'],
            'localhost' => ['::1', '0000:0000:0000:0000:0000:0000:0000:0001'],
            'expansion in middle 1' => ['1::2', '0001:0000:0000:0000:0000:0000:0000:0002'],
            'expansion in middle 2' => ['1:2::3', '0001:0002:0000:0000:0000:0000:0000:0003'],
            'expansion in middle 3' => ['1::2:3', '0001:0000:0000:0000:0000:0000:0002:0003'],
            'expansion in middle 4' => ['1:2::3:4:5', '0001:0002:0000:0000:0000:0003:0004:0005']
        ];
    }

    /**
     * @test
     * @dataProvider normalizeCompressIPv6DataProviderCorrect
     */
    public function normalizeIPv6CorrectlyNormalizesAddresses($compressed, $normalized)
    {
        $this->assertEquals($normalized, GeneralUtility::normalizeIPv6($compressed));
    }

    /**
     * @test
     * @dataProvider normalizeCompressIPv6DataProviderCorrect
     */
    public function compressIPv6CorrectlyCompressesAdresses($compressed, $normalized)
    {
        $this->assertEquals($compressed, GeneralUtility::compressIPv6($normalized));
    }

    /**
     * @test
     */
    public function compressIPv6CorrectlyCompressesAdressWithSomeAddressOnRightSide()
    {
        if (strtolower(PHP_OS) === 'darwin') {
            $this->markTestSkipped('This test does not work on OSX / Darwin OS.');
        }
        $this->assertEquals('::f0f', GeneralUtility::compressIPv6('0000:0000:0000:0000:0000:0000:0000:0f0f'));
    }

    ///////////////////////////////
    // Tests concerning validIP
    ///////////////////////////////
    /**
     * Data provider for checkValidIpReturnsTrueForValidIp
     *
     * @return array Data sets
     */
    public static function validIpDataProvider()
    {
        return [
            '0.0.0.0' => ['0.0.0.0'],
            'private IPv4 class C' => ['192.168.0.1'],
            'private IPv4 class A' => ['10.0.13.1'],
            'private IPv6' => ['fe80::daa2:5eff:fe8b:7dfb']
        ];
    }

    /**
     * @test
     * @dataProvider validIpDataProvider
     */
    public function validIpReturnsTrueForValidIp($ip)
    {
        $this->assertTrue(GeneralUtility::validIP($ip));
    }

    /**
     * Data provider for checkValidIpReturnsFalseForInvalidIp
     *
     * @return array Data sets
     */
    public static function invalidIpDataProvider()
    {
        return [
            'null' => [null],
            'zero' => [0],
            'string' => ['test'],
            'string empty' => [''],
            'string NULL' => ['NULL'],
            'out of bounds IPv4' => ['300.300.300.300'],
            'dotted decimal notation with only two dots' => ['127.0.1']
        ];
    }

    /**
     * @test
     * @dataProvider invalidIpDataProvider
     */
    public function validIpReturnsFalseForInvalidIp($ip)
    {
        $this->assertFalse(GeneralUtility::validIP($ip));
    }

    ///////////////////////////////
    // Tests concerning cmpFQDN
    ///////////////////////////////
    /**
     * Data provider for cmpFqdnReturnsTrue
     *
     * @return array Data sets
     */
    public static function cmpFqdnValidDataProvider()
    {
        return [
            'localhost should usually resolve, IPv4' => ['127.0.0.1', '*'],
            'localhost should usually resolve, IPv6' => ['::1', '*'],
            // other testcases with resolving not possible since it would
            // require a working IPv4/IPv6-connectivity
            'aaa.bbb.ccc.ddd.eee, full' => ['aaa.bbb.ccc.ddd.eee', 'aaa.bbb.ccc.ddd.eee'],
            'aaa.bbb.ccc.ddd.eee, wildcard first' => ['aaa.bbb.ccc.ddd.eee', '*.ccc.ddd.eee'],
            'aaa.bbb.ccc.ddd.eee, wildcard last' => ['aaa.bbb.ccc.ddd.eee', 'aaa.bbb.ccc.*'],
            'aaa.bbb.ccc.ddd.eee, wildcard middle' => ['aaa.bbb.ccc.ddd.eee', 'aaa.*.eee'],
            'list-matches, 1' => ['aaa.bbb.ccc.ddd.eee', 'xxx, yyy, zzz, aaa.*.eee'],
            'list-matches, 2' => ['aaa.bbb.ccc.ddd.eee', '127:0:0:1,,aaa.*.eee,::1']
        ];
    }

    /**
     * @test
     * @dataProvider cmpFqdnValidDataProvider
     */
    public function cmpFqdnReturnsTrue($baseHost, $list)
    {
        $this->assertTrue(GeneralUtility::cmpFQDN($baseHost, $list));
    }

    /**
     * Data provider for cmpFqdnReturnsFalse
     *
     * @return array Data sets
     */
    public static function cmpFqdnInvalidDataProvider()
    {
        return [
            'num-parts of hostname to check can only be less or equal than hostname, 1' => ['aaa.bbb.ccc.ddd.eee', 'aaa.bbb.ccc.ddd.eee.fff'],
            'num-parts of hostname to check can only be less or equal than hostname, 2' => ['aaa.bbb.ccc.ddd.eee', 'aaa.*.bbb.ccc.ddd.eee']
        ];
    }

    /**
     * @test
     * @dataProvider cmpFqdnInvalidDataProvider
     */
    public function cmpFqdnReturnsFalse($baseHost, $list)
    {
        $this->assertFalse(GeneralUtility::cmpFQDN($baseHost, $list));
    }

    ///////////////////////////////
    // Tests concerning inList
    ///////////////////////////////
    /**
     * @test
     * @param string $haystack
     * @dataProvider inListForItemContainedReturnsTrueDataProvider
     */
    public function inListForItemContainedReturnsTrue($haystack)
    {
        $this->assertTrue(GeneralUtility::inList($haystack, 'findme'));
    }

    /**
     * Data provider for inListForItemContainedReturnsTrue.
     *
     * @return array
     */
    public function inListForItemContainedReturnsTrueDataProvider()
    {
        return [
            'Element as second element of four items' => ['one,findme,three,four'],
            'Element at beginning of list' => ['findme,one,two'],
            'Element at end of list' => ['one,two,findme'],
            'One item list' => ['findme']
        ];
    }

    /**
     * @test
     * @param string $haystack
     * @dataProvider inListForItemNotContainedReturnsFalseDataProvider
     */
    public function inListForItemNotContainedReturnsFalse($haystack)
    {
        $this->assertFalse(GeneralUtility::inList($haystack, 'findme'));
    }

    /**
     * Data provider for inListForItemNotContainedReturnsFalse.
     *
     * @return array
     */
    public function inListForItemNotContainedReturnsFalseDataProvider()
    {
        return [
            'Four item list' => ['one,two,three,four'],
            'One item list' => ['one'],
            'Empty list' => ['']
        ];
    }

    ///////////////////////////////
    // Tests concerning rmFromList
    ///////////////////////////////
    /**
     * @test
     * @param string $initialList
     * @param string $listWithElementRemoved
     * @dataProvider rmFromListRemovesElementsFromCommaSeparatedListDataProvider
     */
    public function rmFromListRemovesElementsFromCommaSeparatedList($initialList, $listWithElementRemoved)
    {
        $this->assertSame($listWithElementRemoved, GeneralUtility::rmFromList('removeme', $initialList));
    }

    /**
     * Data provider for rmFromListRemovesElementsFromCommaSeparatedList
     *
     * @return array
     */
    public function rmFromListRemovesElementsFromCommaSeparatedListDataProvider()
    {
        return [
            'Element as second element of three' => ['one,removeme,two', 'one,two'],
            'Element at beginning of list' => ['removeme,one,two', 'one,two'],
            'Element at end of list' => ['one,two,removeme', 'one,two'],
            'One item list' => ['removeme', ''],
            'Element not contained in list' => ['one,two,three', 'one,two,three'],
            'Empty element survives' => ['one,,three,,removeme', 'one,,three,'],
            'Empty element survives at start' => [',removeme,three,removeme', ',three'],
            'Empty element survives at end' => ['removeme,three,removeme,', 'three,'],
            'Empty list' => ['', ''],
            'List contains removeme multiple times' => ['removeme,notme,removeme,removeme', 'notme'],
            'List contains removeme multiple times nothing else' => ['removeme,removeme,removeme', ''],
            'List contains removeme multiple times nothing else 2x' => ['removeme,removeme', ''],
            'List contains removeme multiple times nothing else 3x' => ['removeme,removeme,removeme', ''],
            'List contains removeme multiple times nothing else 4x' => ['removeme,removeme,removeme,removeme', ''],
            'List contains removeme multiple times nothing else 5x' => ['removeme,removeme,removeme,removeme,removeme', ''],
        ];
    }

    ///////////////////////////////
    // Tests concerning expandList
    ///////////////////////////////
    /**
     * @test
     * @param string $list
     * @param string $expectation
     * @dataProvider expandListExpandsIntegerRangesDataProvider
     */
    public function expandListExpandsIntegerRanges($list, $expectation)
    {
        $this->assertSame($expectation, GeneralUtility::expandList($list));
    }

    /**
     * Data provider for expandListExpandsIntegerRangesDataProvider
     *
     * @return array
     */
    public function expandListExpandsIntegerRangesDataProvider()
    {
        return [
            'Expand for the same number' => ['1,2-2,7', '1,2,7'],
            'Small range expand with parameters reversed ignores reversed items' => ['1,5-3,7', '1,7'],
            'Small range expand' => ['1,3-5,7', '1,3,4,5,7'],
            'Expand at beginning' => ['3-5,1,7', '3,4,5,1,7'],
            'Expand at end' => ['1,7,3-5', '1,7,3,4,5'],
            'Multiple small range expands' => ['1,3-5,7-10,12', '1,3,4,5,7,8,9,10,12'],
            'One item list' => ['1-5', '1,2,3,4,5'],
            'Nothing to expand' => ['1,2,3,4', '1,2,3,4'],
            'Empty list' => ['', '']
        ];
    }

    /**
     * @test
     */
    public function expandListExpandsForTwoThousandElementsExpandsOnlyToThousandElementsMaximum()
    {
        $list = GeneralUtility::expandList('1-2000');
        $this->assertSame(1000, count(explode(',', $list)));
    }

    ///////////////////////////////
    // Tests concerning uniqueList
    ///////////////////////////////
    /**
     * @test
     * @param string $initialList
     * @param string $unifiedList
     * @dataProvider uniqueListUnifiesCommaSeparatedListDataProvider
     */
    public function uniqueListUnifiesCommaSeparatedList($initialList, $unifiedList)
    {
        $this->assertSame($unifiedList, GeneralUtility::uniqueList($initialList));
    }

    /**
     * Data provider for uniqueListUnifiesCommaSeparatedList
     *
     * @return array
     */
    public function uniqueListUnifiesCommaSeparatedListDataProvider()
    {
        return [
            'List without duplicates' => ['one,two,three', 'one,two,three'],
            'List with two consecutive duplicates' => ['one,two,two,three,three', 'one,two,three'],
            'List with non-consecutive duplicates' => ['one,two,three,two,three', 'one,two,three'],
            'One item list' => ['one', 'one'],
            'Empty list' => ['', '']
        ];
    }

    ///////////////////////////////
    // Tests concerning isFirstPartOfStr
    ///////////////////////////////
    /**
     * Data provider for isFirstPartOfStrReturnsTrueForMatchingFirstParts
     *
     * @return array
     */
    public function isFirstPartOfStrReturnsTrueForMatchingFirstPartDataProvider()
    {
        return [
            'match first part of string' => ['hello world', 'hello'],
            'match whole string' => ['hello', 'hello'],
            'integer is part of string with same number' => ['24', 24],
            'string is part of integer with same number' => [24, '24'],
            'integer is part of string starting with same number' => ['24 beer please', 24]
        ];
    }

    /**
     * @test
     * @dataProvider isFirstPartOfStrReturnsTrueForMatchingFirstPartDataProvider
     */
    public function isFirstPartOfStrReturnsTrueForMatchingFirstPart($string, $part)
    {
        $this->assertTrue(GeneralUtility::isFirstPartOfStr($string, $part));
    }

    /**
     * Data provider for checkIsFirstPartOfStrReturnsFalseForNotMatchingFirstParts
     *
     * @return array
     */
    public function isFirstPartOfStrReturnsFalseForNotMatchingFirstPartDataProvider()
    {
        return [
            'no string match' => ['hello', 'bye'],
            'no case sensitive string match' => ['hello world', 'Hello'],
            'array is not part of string' => ['string', []],
            'string is not part of array' => [[], 'string'],
            'NULL is not part of string' => ['string', null],
            'string is not part of NULL' => [null, 'string'],
            'NULL is not part of array' => [[], null],
            'array is not part of NULL' => [null, []],
            'empty string is not part of empty string' => ['', ''],
            'NULL is not part of empty string' => ['', null],
            'false is not part of empty string' => ['', false],
            'empty string is not part of NULL' => [null, ''],
            'empty string is not part of false' => [false, ''],
            'empty string is not part of zero integer' => [0, ''],
            'zero integer is not part of NULL' => [null, 0],
            'zero integer is not part of empty string' => ['', 0]
        ];
    }

    /**
     * @test
     * @dataProvider isFirstPartOfStrReturnsFalseForNotMatchingFirstPartDataProvider
     */
    public function isFirstPartOfStrReturnsFalseForNotMatchingFirstPart($string, $part)
    {
        $this->assertFalse(GeneralUtility::isFirstPartOfStr($string, $part));
    }

    ///////////////////////////////
    // Tests concerning formatSize
    ///////////////////////////////
    /**
     * @test
     * @dataProvider formatSizeDataProvider
     */
    public function formatSizeTranslatesBytesToHigherOrderRepresentation($size, $labels, $base, $expected)
    {
        $this->assertEquals($expected, GeneralUtility::formatSize($size, $labels, $base));
    }

    /**
     * Data provider for formatSizeTranslatesBytesToHigherOrderRepresentation
     *
     * @return array
     */
    public function formatSizeDataProvider()
    {
        return [
            'IEC Bytes stay bytes (min)' => [1, '', 0, '1 '],
            'IEC Bytes stay bytes (max)' => [921, '', 0, '921 '],
            'IEC Kilobytes are used (min)' => [922, '', 0, '0.90 Ki'],
            'IEC Kilobytes are used (max)' => [943718, '', 0, '922 Ki'],
            'IEC Megabytes are used (min)' => [943719, '', 0, '0.90 Mi'],
            'IEC Megabytes are used (max)' => [966367641, '', 0, '922 Mi'],
            'IEC Gigabytes are used (min)' => [966367642, '', 0, '0.90 Gi'],
            'IEC Gigabytes are used (max)' => [989560464998, '', 0, '922 Gi'],
            'IEC Decimal is omitted for large kilobytes' => [31080, '', 0, '30 Ki'],
            'IEC Decimal is omitted for large megabytes' => [31458000, '', 0, '30 Mi'],
            'IEC Decimal is omitted for large gigabytes' => [32212254720, '', 0, '30 Gi'],
            'SI Bytes stay bytes (min)' => [1, 'si', 0, '1 '],
            'SI Bytes stay bytes (max)' => [899, 'si', 0, '899 '],
            'SI Kilobytes are used (min)' => [901, 'si', 0, '0.90 k'],
            'SI Kilobytes are used (max)' => [900000, 'si', 0, '900 k'],
            'SI Megabytes are used (min)' => [900001, 'si', 0, '0.90 M'],
            'SI Megabytes are used (max)' => [900000000, 'si', 0, '900 M'],
            'SI Gigabytes are used (min)' => [900000001, 'si', 0, '0.90 G'],
            'SI Gigabytes are used (max)' => [900000000000, 'si', 0, '900 G'],
            'SI Decimal is omitted for large kilobytes' => [30000, 'si', 0, '30 k'],
            'SI Decimal is omitted for large megabytes' => [30000000, 'si', 0, '30 M'],
            'SI Decimal is omitted for large gigabytes' => [30000000000, 'si', 0, '30 G'],
            'Label for bytes can be exchanged (binary unit)' => [1, ' Foo|||', 0, '1 Foo'],
            'Label for kilobytes can be exchanged (binary unit)' => [1024, '| Foo||', 0, '1.00 Foo'],
            'Label for megabyes can be exchanged (binary unit)' => [1048576, '|| Foo|', 0, '1.00 Foo'],
            'Label for gigabytes can be exchanged (binary unit)' => [1073741824, '||| Foo', 0, '1.00 Foo'],
            'Label for bytes can be exchanged (decimal unit)' => [1, ' Foo|||', 1000, '1 Foo'],
            'Label for kilobytes can be exchanged (decimal unit)' => [1000, '| Foo||', 1000, '1.00 Foo'],
            'Label for megabyes can be exchanged (decimal unit)' => [1000000, '|| Foo|', 1000, '1.00 Foo'],
            'Label for gigabytes can be exchanged (decimal unit)' => [1000000000, '||| Foo', 1000, '1.00 Foo'],
            'IEC Base is ignored' => [1024, 'iec', 1000, '1.00 Ki'],
            'SI Base is ignored' => [1000, 'si', 1024, '1.00 k'],
            'Use binary base for unexpected base' => [2048, '| Bar||', 512, '2.00 Bar']
        ];
    }

    ///////////////////////////////
    // Tests concerning splitCalc
    ///////////////////////////////
    /**
     * Data provider for splitCalc
     *
     * @return array expected values, arithmetic expression
     */
    public function splitCalcDataProvider()
    {
        return [
            'empty string returns empty array' => [
                [],
                ''
            ],
            'number without operator returns array with plus and number' => [
                [['+', 42]],
                '42'
            ],
            'two numbers with asterisk return first number with plus and second number with asterisk' => [
                [['+', 42], ['*', 31]],
                '42 * 31'
            ]
        ];
    }

    /**
     * @test
     * @dataProvider splitCalcDataProvider
     */
    public function splitCalcCorrectlySplitsExpression($expected, $expression)
    {
        $this->assertEquals($expected, GeneralUtility::splitCalc($expression, '+-*/'));
    }

    ///////////////////////////////
    // Tests concerning htmlspecialchars_decode
    ///////////////////////////////
    /**
     * @test
     */
    public function htmlspecialcharsDecodeReturnsDecodedString()
    {
        $string = '<typo3 version="6.0">&nbsp;</typo3>';
        $encoded = htmlspecialchars($string);
        $decoded = htmlspecialchars_decode($encoded);
        $this->assertEquals($string, $decoded);
    }

    ///////////////////////////////
    // Tests concerning deHSCentities
    ///////////////////////////////
    /**
     * @test
     * @dataProvider deHSCentitiesReturnsDecodedStringDataProvider
     */
    public function deHSCentitiesReturnsDecodedString($input, $expected)
    {
        $this->assertEquals($expected, GeneralUtility::deHSCentities($input));
    }

    /**
     * Data provider for deHSCentitiesReturnsDecodedString
     *
     * @return array
     */
    public function deHSCentitiesReturnsDecodedStringDataProvider()
    {
        return [
            'Empty string' => ['', ''],
            'Double encoded &' => ['&amp;amp;', '&amp;'],
            'Double encoded numeric entity' => ['&amp;#1234;', '&#1234;'],
            'Double encoded hexadecimal entity' => ['&amp;#x1b;', '&#x1b;'],
            'Single encoded entities are not touched' => ['&amp; &#1234; &#x1b;', '&amp; &#1234; &#x1b;']
        ];
    }

    //////////////////////////////////
    // Tests concerning slashJS
    //////////////////////////////////
    /**
     * @test
     * @dataProvider slashJsDataProvider
     */
    public function slashJsEscapesSingleQuotesAndSlashes($input, $extended, $expected)
    {
        $this->assertEquals($expected, GeneralUtility::slashJS($input, $extended));
    }

    /**
     * Data provider for slashJsEscapesSingleQuotesAndSlashes
     *
     * @return array
     */
    public function slashJsDataProvider()
    {
        return [
            'Empty string is not changed' => ['', false, ''],
            'Normal string is not changed' => ['The cake is a lie √', false, 'The cake is a lie √'],
            'String with single quotes' => ['The \'cake\' is a lie', false, 'The \\\'cake\\\' is a lie'],
            'String with single quotes and backslashes - just escape single quotes' => ['The \\\'cake\\\' is a lie', false, 'The \\\\\'cake\\\\\' is a lie'],
            'String with single quotes and backslashes - escape both' => ['The \\\'cake\\\' is a lie', true, 'The \\\\\\\'cake\\\\\\\' is a lie']
        ];
    }

    //////////////////////////////////
    // Tests concerning rawUrlEncodeJS
    //////////////////////////////////
    /**
     * @test
     */
    public function rawUrlEncodeJsPreservesWhitespaces()
    {
        $input = 'Encode \'me\', but leave my spaces √';
        $expected = 'Encode %27me%27%2C but leave my spaces %E2%88%9A';
        $this->assertEquals($expected, GeneralUtility::rawUrlEncodeJS($input));
    }

    //////////////////////////////////
    // Tests concerning rawUrlEncodeJS
    //////////////////////////////////
    /**
     * @test
     */
    public function rawUrlEncodeFpPreservesSlashes()
    {
        $input = 'Encode \'me\', but leave my / √';
        $expected = 'Encode%20%27me%27%2C%20but%20leave%20my%20/%20%E2%88%9A';
        $this->assertEquals($expected, GeneralUtility::rawUrlEncodeFP($input));
    }

    //////////////////////////////////
    // Tests concerning strtoupper / strtolower
    //////////////////////////////////
    /**
     * Data provider for strtoupper and strtolower
     *
     * @return array
     */
    public function strtouppperDataProvider()
    {
        return [
            'Empty string' => ['', ''],
            'String containing only latin characters' => ['the cake is a lie.', 'THE CAKE IS A LIE.'],
            'String with umlauts and accent characters' => ['the càkê is ä lie.', 'THE CàKê IS ä LIE.']
        ];
    }

    /**
     * @test
     * @dataProvider strtouppperDataProvider
     */
    public function strtoupperConvertsOnlyLatinCharacters($input, $expected)
    {
        $this->assertEquals($expected, GeneralUtility::strtoupper($input));
    }

    /**
     * @test
     * @dataProvider strtouppperDataProvider
     */
    public function strtolowerConvertsOnlyLatinCharacters($expected, $input)
    {
        $this->assertEquals($expected, GeneralUtility::strtolower($input));
    }

    //////////////////////////////////
    // Tests concerning validEmail
    //////////////////////////////////
    /**
     * Data provider for valid validEmail's
     *
     * @return array Valid email addresses
     */
    public function validEmailValidDataProvider()
    {
        return [
            'short mail address' => ['a@b.c'],
            'simple mail address' => ['test@example.com'],
            'uppercase characters' => ['QWERTYUIOPASDFGHJKLZXCVBNM@QWERTYUIOPASDFGHJKLZXCVBNM.NET'],
            'equal sign in local part' => ['test=mail@example.com'],
            'dash in local part' => ['test-mail@example.com'],
            'plus in local part' => ['test+mail@example.com'],
            'question mark in local part' => ['test?mail@example.com'],
            'slash in local part' => ['foo/bar@example.com'],
            'hash in local part' => ['foo#bar@example.com'],
            'dot in local part' => ['firstname.lastname@employee.2something.com'],
            'dash as local part' => ['-@foo.com'],
            'umlauts in domain part' => ['foo@äöüfoo.com']
        ];
    }

    /**
     * @test
     * @dataProvider validEmailValidDataProvider
     */
    public function validEmailReturnsTrueForValidMailAddress($address)
    {
        $this->assertTrue(GeneralUtility::validEmail($address));
    }

    /**
     * Data provider for invalid validEmail's
     *
     * @return array Invalid email addresses
     */
    public function validEmailInvalidDataProvider()
    {
        return [
            'empty string' => [''],
            'empty array' => [[]],
            'integer' => [42],
            'float' => [42.23],
            'array' => [['foo']],
            'object' => [new \stdClass()],
            '@ sign only' => ['@'],
            'string longer than 320 characters' => [str_repeat('0123456789', 33)],
            'duplicate @' => ['test@@example.com'],
            'duplicate @ combined with further special characters in local part' => ['test!.!@#$%^&*@example.com'],
            'opening parenthesis in local part' => ['foo(bar@example.com'],
            'closing parenthesis in local part' => ['foo)bar@example.com'],
            'opening square bracket in local part' => ['foo[bar@example.com'],
            'closing square bracket as local part' => [']@example.com'],
            'top level domain only' => ['test@com'],
            'dash as second level domain' => ['foo@-.com'],
            'domain part starting with dash' => ['foo@-foo.com'],
            'domain part ending with dash' => ['foo@foo-.com'],
            'number as top level domain' => ['foo@bar.123'],
            'dot at beginning of domain part' => ['test@.com'],
            'local part ends with dot' => ['e.x.a.m.p.l.e.@example.com'],
            'umlauts in local part' => ['äöüfoo@bar.com'],
            'trailing whitespace' => ['test@example.com '],
            'trailing carriage return' => ['test@example.com' . CR],
            'trailing linefeed' => ['test@example.com' . LF],
            'trailing carriage return linefeed' => ['test@example.com' . CRLF],
            'trailing tab' => ['test@example.com' . TAB]
        ];
    }

    /**
     * @test
     * @dataProvider validEmailInvalidDataProvider
     */
    public function validEmailReturnsFalseForInvalidMailAddress($address)
    {
        $this->assertFalse(GeneralUtility::validEmail($address));
    }

    //////////////////////////////////
    // Tests concerning intExplode
    //////////////////////////////////
    /**
     * @test
     */
    public function intExplodeConvertsStringsToInteger()
    {
        $testString = '1,foo,2';
        $expectedArray = [1, 0, 2];
        $actualArray = GeneralUtility::intExplode(',', $testString);
        $this->assertEquals($expectedArray, $actualArray);
    }

    //////////////////////////////////
    // Tests concerning implodeArrayForUrl / explodeUrl2Array
    //////////////////////////////////
    /**
     * Data provider for implodeArrayForUrlBuildsValidParameterString and
     * explodeUrl2ArrayTransformsParameterStringToArray
     *
     * @return array
     */
    public function implodeArrayForUrlDataProvider()
    {
        $valueArray = ['one' => '√', 'two' => 2];
        return [
            'Empty input' => ['foo', [], ''],
            'String parameters' => ['foo', $valueArray, '&foo[one]=%E2%88%9A&foo[two]=2'],
            'Nested array parameters' => ['foo', [$valueArray], '&foo[0][one]=%E2%88%9A&foo[0][two]=2'],
            'Keep blank parameters' => ['foo', ['one' => '√', ''], '&foo[one]=%E2%88%9A&foo[0]=']
        ];
    }

    /**
     * @test
     * @dataProvider implodeArrayForUrlDataProvider
     */
    public function implodeArrayForUrlBuildsValidParameterString($name, $input, $expected)
    {
        $this->assertSame($expected, GeneralUtility::implodeArrayForUrl($name, $input));
    }

    /**
     * @test
     */
    public function implodeArrayForUrlCanSkipEmptyParameters()
    {
        $input = ['one' => '√', ''];
        $expected = '&foo[one]=%E2%88%9A';
        $this->assertSame($expected, GeneralUtility::implodeArrayForUrl('foo', $input, '', true));
    }

    /**
     * @test
     */
    public function implodeArrayForUrlCanUrlEncodeKeyNames()
    {
        $input = ['one' => '√', ''];
        $expected = '&foo%5Bone%5D=%E2%88%9A&foo%5B0%5D=';
        $this->assertSame($expected, GeneralUtility::implodeArrayForUrl('foo', $input, '', false, true));
    }

    /**
     * @test
     * @dataProvider implodeArrayForUrlDataProvider
     */
    public function explodeUrl2ArrayTransformsParameterStringToNestedArray($name, $array, $input)
    {
        $expected = $array ? [$name => $array] : [];
        $this->assertEquals($expected, GeneralUtility::explodeUrl2Array($input, true));
    }

    /**
     * @test
     * @dataProvider explodeUrl2ArrayDataProvider
     */
    public function explodeUrl2ArrayTransformsParameterStringToFlatArray($input, $expected)
    {
        $this->assertEquals($expected, GeneralUtility::explodeUrl2Array($input, false));
    }

    /**
     * Data provider for explodeUrl2ArrayTransformsParameterStringToFlatArray
     *
     * @return array
     */
    public function explodeUrl2ArrayDataProvider()
    {
        return [
            'Empty string' => ['', []],
            'Simple parameter string' => ['&one=%E2%88%9A&two=2', ['one' => '√', 'two' => 2]],
            'Nested parameter string' => ['&foo[one]=%E2%88%9A&two=2', ['foo[one]' => '√', 'two' => 2]]
        ];
    }

    //////////////////////////////////
    // Tests concerning compileSelectedGetVarsFromArray
    //////////////////////////////////
    /**
     * @test
     */
    public function compileSelectedGetVarsFromArrayFiltersIncomingData()
    {
        $filter = 'foo,bar';
        $getArray = ['foo' => 1, 'cake' => 'lie'];
        $expected = ['foo' => 1];
        $result = GeneralUtility::compileSelectedGetVarsFromArray($filter, $getArray, false);
        $this->assertSame($expected, $result);
    }

    /**
     * @test
     */
    public function compileSelectedGetVarsFromArrayUsesGetPostDataFallback()
    {
        $_GET['bar'] = '2';
        $filter = 'foo,bar';
        $getArray = ['foo' => 1, 'cake' => 'lie'];
        $expected = ['foo' => 1, 'bar' => '2'];
        $result = GeneralUtility::compileSelectedGetVarsFromArray($filter, $getArray, true);
        $this->assertSame($expected, $result);
    }

    //////////////////////////////////
    // Tests concerning revExplode
    //////////////////////////////////

    /**
     * @return array
     */
    public function revExplodeDataProvider()
    {
        return [
            'limit 0 should return unexploded string' => [
                ':',
                'my:words:here',
                0,
                ['my:words:here']
            ],
            'limit 1 should return unexploded string' => [
                ':',
                'my:words:here',
                1,
                ['my:words:here']
            ],
            'limit 2 should return two pieces' => [
                ':',
                'my:words:here',
                2,
                ['my:words', 'here']
            ],
            'limit 3 should return unexploded string' => [
                ':',
                'my:words:here',
                3,
                ['my', 'words', 'here']
            ],
            'limit 0 should return unexploded string if no delimiter is contained' => [
                ':',
                'mywordshere',
                0,
                ['mywordshere']
            ],
            'limit 1 should return unexploded string if no delimiter is contained' => [
                ':',
                'mywordshere',
                1,
                ['mywordshere']
            ],
            'limit 2 should return unexploded string if no delimiter is contained' => [
                ':',
                'mywordshere',
                2,
                ['mywordshere']
            ],
            'limit 3 should return unexploded string if no delimiter is contained' => [
                ':',
                'mywordshere',
                3,
                ['mywordshere']
            ],
            'multi character delimiter is handled properly with limit 2' => [
                '[]',
                'a[b][c][d]',
                2,
                ['a[b][c', 'd]']
            ],
            'multi character delimiter is handled properly with limit 3' => [
                '[]',
                'a[b][c][d]',
                3,
                ['a[b', 'c', 'd]']
            ],
        ];
    }

    /**
     * @test
     * @dataProvider revExplodeDataProvider
     */
    public function revExplodeCorrectlyExplodesStringForGivenPartsCount($delimiter, $testString, $count, $expectedArray)
    {
        $actualArray = GeneralUtility::revExplode($delimiter, $testString, $count);
        $this->assertEquals($expectedArray, $actualArray);
    }

    /**
     * @test
     */
    public function revExplodeRespectsLimitThreeWhenExploding()
    {
        $testString = 'even:more:of:my:words:here';
        $expectedArray = ['even:more:of:my', 'words', 'here'];
        $actualArray = GeneralUtility::revExplode(':', $testString, 3);
        $this->assertEquals($expectedArray, $actualArray);
    }

    //////////////////////////////////
    // Tests concerning trimExplode
    //////////////////////////////////
    /**
     * @test
     * @dataProvider trimExplodeReturnsCorrectResultDataProvider
     *
     * @param string $delimiter
     * @param string $testString
     * @param bool $removeEmpty
     * @param int $limit
     * @param array $expectedResult
     */
    public function trimExplodeReturnsCorrectResult($delimiter, $testString, $removeEmpty, $limit, $expectedResult)
    {
        $this->assertSame($expectedResult, GeneralUtility::trimExplode($delimiter, $testString, $removeEmpty, $limit));
    }

    /**
     * @return array
     */
    public function trimExplodeReturnsCorrectResultDataProvider()
    {
        return [
            'spaces at element start and end' => [
                ',',
                ' a , b , c ,d ,,  e,f,',
                false,
                0,
                ['a', 'b', 'c', 'd', '', 'e', 'f', '']
            ],
            'removes newline' => [
                ',',
                ' a , b , ' . LF . ' ,d ,,  e,f,',
                true,
                0,
                ['a', 'b', 'd', 'e', 'f']
            ],
            'removes empty elements' => [
                ',',
                'a , b , c , ,d ,, ,e,f,',
                true,
                0,
                ['a', 'b', 'c', 'd', 'e', 'f']
            ],
            'keeps remaining results with empty items after reaching limit with positive parameter' => [
                ',',
                ' a , b , c , , d,, ,e ',
                false,
                3,
                ['a', 'b', 'c , , d,, ,e']
            ],
            'keeps remaining results without empty items after reaching limit with positive parameter' => [
                ',',
                ' a , b , c , , d,, ,e ',
                true,
                3,
                ['a', 'b', 'c , d,e']
            ],
            'keeps remaining results with empty items after reaching limit with negative parameter' => [
                ',',
                ' a , b , c , d, ,e, f , , ',
                false,
                -3,
                ['a', 'b', 'c', 'd', '', 'e']
            ],
            'keeps remaining results without empty items after reaching limit with negative parameter' => [
                ',',
                ' a , b , c , d, ,e, f , , ',
                true,
                -3,
                ['a', 'b', 'c']
            ],
            'returns exact results without reaching limit with positive parameter' => [
                ',',
                ' a , b , , c , , , ',
                true,
                4,
                ['a', 'b', 'c']
            ],
            'keeps zero as string' => [
                ',',
                'a , b , c , ,d ,, ,e,f, 0 ,',
                true,
                0,
                ['a', 'b', 'c', 'd', 'e', 'f', '0']
            ],
            'keeps whitespace inside elements' => [
                ',',
                'a , b , c , ,d ,, ,e,f, g h ,',
                true,
                0,
                ['a', 'b', 'c', 'd', 'e', 'f', 'g h']
            ],
            'can use internal regex delimiter as explode delimiter' => [
                '/',
                'a / b / c / /d // /e/f/ g h /',
                true,
                0,
                ['a', 'b', 'c', 'd', 'e', 'f', 'g h']
            ],
            'can use whitespaces as delimiter' => [
                ' ',
                '* * * * *',
                true,
                0,
                ['*', '*', '*', '*', '*']
            ],
            'can use words as delimiter' => [
                'All',
                'HelloAllTogether',
                true,
                0,
                ['Hello', 'Together']
            ],
            'can use word with appended and prepended spaces as delimiter' => [
                ' all   ',
                'Hello all   together',
                true,
                0,
                ['Hello', 'together']
            ],
            'can use word with appended and prepended spaces as delimiter and do not remove empty' => [
                ' all   ',
                'Hello all   together     all      there all       all   are  all    none',
                false,
                0,
                ['Hello', 'together', 'there', '', 'are', 'none']
            ],
            'can use word with appended and prepended spaces as delimiter, do not remove empty and limit' => [
                ' all   ',
                'Hello all   together     all      there all       all   are  all    none',
                false,
                5,
                ['Hello', 'together', 'there', '', 'are  all    none']
            ],
            'can use word with appended and prepended spaces as delimiter, do not remove empty, limit and multiple delimiter in last' => [
                ' all   ',
                'Hello all   together     all      there all       all   are  all    none',
                false,
                4,
                ['Hello', 'together', 'there', 'all   are  all    none']
            ],
            'can use word with appended and prepended spaces as delimiter, remove empty and limit' => [
                ' all   ',
                'Hello all   together     all      there all       all   are  all    none',
                true,
                4,
                ['Hello', 'together', 'there', 'are  all    none']
            ],
            'can use word with appended and prepended spaces as delimiter, remove empty and limit and multiple delimiter in last' => [
                ' all   ',
                'Hello all   together     all      there all       all   are  all    none',
                true,
                5,
                ['Hello', 'together', 'there', 'are' , 'none']
            ],
            'can use words as delimiter and do not remove empty' => [
                'all  there',
                'Helloall  theretogether  all  there    all  there   are   all  there     none',
                false,
                0,
                ['Hello', 'together', '', 'are', 'none']
            ],
            'can use words as delimiter, do not remove empty and limit' => [
                'all  there',
                'Helloall  theretogether  all  there    all  there    are   all  there     none',
                false,
                4,
                ['Hello', 'together', '', 'are   all  there     none']
            ],
            'can use words as delimiter, do not remove empty, limit and multiple delimiter in last' => [
                'all  there',
                'Helloall  theretogether  all  there    all  there    are   all  there     none',
                false,
                3,
                ['Hello', 'together', 'all  there    are   all  there     none']
            ],
            'can use words as delimiter, remove empty' => [
                'all  there',
                'Helloall  theretogether  all  there    all  there    are   all  there     none',
                true,
                0,
                ['Hello', 'together', 'are', 'none']
            ],
            'can use words as delimiter, remove empty and limit' => [
                'all  there',
                'Helloall  theretogether  all  there    all  there    are   all  there     none',
                true,
                3,
                ['Hello', 'together', 'are   all  there     none']
            ],
            'can use words as delimiter, remove empty and limit and multiple delimiter in last' => [
                'all  there',
                'Helloall  theretogether  all  there    all  there    are   all  there     none',
                true,
                4,
                ['Hello', 'together', 'are' , 'none']
            ],
            'can use new line as delimiter' => [
                LF,
                "Hello\nall\ntogether",
                true,
                0,
                ['Hello', 'all', 'together']
            ],
            'works with whitespace separator' => [
                "\t",
                " a  b \t c  \t  \t    d  \t  e     \t u j   \t s",
                false,
                0,
                ['a  b', 'c', '', 'd', 'e', 'u j', 's']
            ],
            'works with whitespace separator and limit' => [
                "\t",
                " a  b \t c  \t  \t    d  \t  e     \t u j   \t s",
                false,
                4,
                ['a  b', 'c', '', "d  \t  e     \t u j   \t s"]
            ],
            'works with whitespace separator and remove empty' => [
                "\t",
                " a  b \t c  \t  \t    d  \t  e     \t u j   \t s",
                true,
                0,
                ['a  b', 'c', 'd', 'e', 'u j', 's']
            ],
            'works with whitespace separator remove empty and limit' => [
                "\t",
                " a  b \t c  \t  \t    d  \t  e     \t u j   \t s",
                true,
                3,
                ['a  b', 'c', "d  \t  e     \t u j   \t s"]
            ],
        ];
    }

    //////////////////////////////////
    // Tests concerning getBytesFromSizeMeasurement
    //////////////////////////////////
    /**
     * Data provider for getBytesFromSizeMeasurement
     *
     * @return array expected value, input string
     */
    public function getBytesFromSizeMeasurementDataProvider()
    {
        return [
            '100 kilo Bytes' => ['102400', '100k'],
            '100 mega Bytes' => ['104857600', '100m'],
            '100 giga Bytes' => ['107374182400', '100g']
        ];
    }

    /**
     * @test
     * @dataProvider getBytesFromSizeMeasurementDataProvider
     */
    public function getBytesFromSizeMeasurementCalculatesCorrectByteValue($expected, $byteString)
    {
        $this->assertEquals($expected, GeneralUtility::getBytesFromSizeMeasurement($byteString));
    }

    //////////////////////////////////
    // Tests concerning getIndpEnv
    //////////////////////////////////
    /**
     * @test
     */
    public function getIndpEnvTypo3SitePathReturnNonEmptyString()
    {
        $this->assertTrue(strlen(GeneralUtility::getIndpEnv('TYPO3_SITE_PATH')) >= 1);
    }

    /**
     * @test
     */
    public function getIndpEnvTypo3SitePathReturnsStringStartingWithSlash()
    {
        $_SERVER['SCRIPT_NAME'] = '/typo3/';
        $result = GeneralUtility::getIndpEnv('TYPO3_SITE_PATH');
        $this->assertEquals('/', $result[0]);
    }

    /**
     * @test
     */
    public function getIndpEnvTypo3SitePathReturnsStringStartingWithDrive()
    {
        if (TYPO3_OS !== 'WIN') {
            $this->markTestSkipped('Test available only on Windows OS.');
        }
        $result = GeneralUtility::getIndpEnv('TYPO3_SITE_PATH');
        $this->assertRegExp('/^[a-z]:\//i', $result);
    }

    /**
     * @test
     */
    public function getIndpEnvTypo3SitePathReturnsStringEndingWithSlash()
    {
        $result = GeneralUtility::getIndpEnv('TYPO3_SITE_PATH');
        $this->assertEquals('/', $result[strlen($result) - 1]);
    }

    /**
     * @return array
     */
    public static function hostnameAndPortDataProvider()
    {
        return [
            'localhost ipv4 without port' => ['127.0.0.1', '127.0.0.1', ''],
            'localhost ipv4 with port' => ['127.0.0.1:81', '127.0.0.1', '81'],
            'localhost ipv6 without port' => ['[::1]', '[::1]', ''],
            'localhost ipv6 with port' => ['[::1]:81', '[::1]', '81'],
            'ipv6 without port' => ['[2001:DB8::1]', '[2001:DB8::1]', ''],
            'ipv6 with port' => ['[2001:DB8::1]:81', '[2001:DB8::1]', '81'],
            'hostname without port' => ['lolli.did.this', 'lolli.did.this', ''],
            'hostname with port' => ['lolli.did.this:42', 'lolli.did.this', '42']
        ];
    }

    /**
     * @test
     * @dataProvider hostnameAndPortDataProvider
     */
    public function getIndpEnvTypo3HostOnlyParsesHostnamesAndIpAdresses($httpHost, $expectedIp)
    {
        GeneralUtility::flushInternalRuntimeCaches();
        $_SERVER['HTTP_HOST'] = $httpHost;
        $this->assertEquals($expectedIp, GeneralUtility::getIndpEnv('TYPO3_HOST_ONLY'));
    }

    /**
     * @test
     */
    public function isAllowedHostHeaderValueReturnsFalseIfTrusedHostsIsNotConfigured()
    {
        unset($GLOBALS['TYPO3_CONF_VARS']['SYS']['trustedHostsPattern']);
        $this->assertFalse(GeneralUtilityFixture::isAllowedHostHeaderValue('evil.foo.bar'));
    }

    /**
     * @return array
     */
    public static function hostnamesMatchingTrustedHostsConfigurationDataProvider()
    {
        return [
            'hostname without port matching' => ['lolli.did.this', '.*\.did\.this'],
            'other hostname without port matching' => ['helmut.did.this', '.*\.did\.this'],
            'two different hostnames without port matching 1st host' => ['helmut.is.secure', '(helmut\.is\.secure|lolli\.is\.secure)'],
            'two different hostnames without port matching 2nd host' => ['lolli.is.secure', '(helmut\.is\.secure|lolli\.is\.secure)'],
            'hostname with port matching' => ['lolli.did.this:42', '.*\.did\.this:42'],
            'hostnames are case insensitive 1' => ['lolli.DID.this:42', '.*\.did.this:42'],
            'hostnames are case insensitive 2' => ['lolli.did.this:42', '.*\.DID.this:42'],
        ];
    }

    /**
     * @return array
     */
    public static function hostnamesNotMatchingTrustedHostsConfigurationDataProvider()
    {
        return [
            'hostname without port' => ['lolli.did.this', 'helmut\.did\.this'],
            'hostname with port, but port not allowed' => ['lolli.did.this:42', 'helmut\.did\.this'],
            'two different hostnames in pattern but host header starts with different value #1' => ['sub.helmut.is.secure', '(helmut\.is\.secure|lolli\.is\.secure)'],
            'two different hostnames in pattern but host header starts with different value #2' => ['sub.lolli.is.secure', '(helmut\.is\.secure|lolli\.is\.secure)'],
            'two different hostnames in pattern but host header ends with different value #1' => ['helmut.is.secure.tld', '(helmut\.is\.secure|lolli\.is\.secure)'],
            'two different hostnames in pattern but host header ends with different value #2' => ['lolli.is.secure.tld', '(helmut\.is\.secure|lolli\.is\.secure)'],
        ];
    }

    /**
     * @param string $httpHost HTTP_HOST string
     * @param string $hostNamePattern trusted hosts pattern
     * @test
     * @dataProvider hostnamesMatchingTrustedHostsConfigurationDataProvider
     */
    public function isAllowedHostHeaderValueReturnsTrueIfHostValueMatches($httpHost, $hostNamePattern)
    {
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['trustedHostsPattern'] = $hostNamePattern;
        $this->assertTrue(GeneralUtilityFixture::isAllowedHostHeaderValue($httpHost));
    }

    /**
     * @param string $httpHost HTTP_HOST string
     * @param string $hostNamePattern trusted hosts pattern
     * @test
     * @dataProvider hostnamesNotMatchingTrustedHostsConfigurationDataProvider
     */
    public function isAllowedHostHeaderValueReturnsFalseIfHostValueMatches($httpHost, $hostNamePattern)
    {
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['trustedHostsPattern'] = $hostNamePattern;
        $this->assertFalse(GeneralUtilityFixture::isAllowedHostHeaderValue($httpHost));
    }

    public function serverNamePatternDataProvider()
    {
        return [
            'host value matches server name and server port is default http' => [
                'httpHost' => 'secure.web.server',
                'serverName' => 'secure.web.server',
                'isAllowed' => true,
                'serverPort' => '80',
                'ssl' => 'Off',
            ],
            'host value matches server name if compared case insensitive 1' => [
                'httpHost' => 'secure.web.server',
                'serverName' => 'secure.WEB.server',
                'isAllowed' => true,
            ],
            'host value matches server name if compared case insensitive 2' => [
                'httpHost' => 'secure.WEB.server',
                'serverName' => 'secure.web.server',
                'isAllowed' => true,
            ],
            'host value matches server name and server port is default https' => [
                'httpHost' => 'secure.web.server',
                'serverName' => 'secure.web.server',
                'isAllowed' => true,
                'serverPort' => '443',
                'ssl' => 'On',
            ],
            'host value matches server name and server port' => [
                'httpHost' => 'secure.web.server:88',
                'serverName' => 'secure.web.server',
                'isAllowed' => true,
                'serverPort' => '88',
            ],
            'host value matches server name case insensitive 1 and server port' => [
                'httpHost' => 'secure.WEB.server:88',
                'serverName' => 'secure.web.server',
                'isAllowed' => true,
                'serverPort' => '88',
            ],
            'host value matches server name case insensitive 2 and server port' => [
                'httpHost' => 'secure.web.server:88',
                'serverName' => 'secure.WEB.server',
                'isAllowed' => true,
                'serverPort' => '88',
            ],
            'host value is ipv6 but matches server name and server port' => [
                'httpHost' => '[::1]:81',
                'serverName' => '[::1]',
                'isAllowed' => true,
                'serverPort' => '81',
            ],
            'host value does not match server name' => [
                'httpHost' => 'insecure.web.server',
                'serverName' => 'secure.web.server',
                'isAllowed' => false,
            ],
            'host value does not match server port' => [
                'httpHost' => 'secure.web.server:88',
                'serverName' => 'secure.web.server',
                'isAllowed' => false,
                'serverPort' => '89',
            ],
            'host value has default port that does not match server port' => [
                'httpHost' => 'secure.web.server',
                'serverName' => 'secure.web.server',
                'isAllowed' => false,
                'serverPort' => '81',
                'ssl' => 'Off',
            ],
            'host value has default port that does not match server ssl port' => [
                'httpHost' => 'secure.web.server',
                'serverName' => 'secure.web.server',
                'isAllowed' => false,
                'serverPort' => '444',
                'ssl' => 'On',
            ],
        ];
    }

    /**
     * @param string $httpHost
     * @param string $serverName
     * @param bool $isAllowed
     * @param string $serverPort
     * @param string $ssl
     *
     * @test
     * @dataProvider serverNamePatternDataProvider
     */
    public function isAllowedHostHeaderValueWorksCorrectlyWithWithServerNamePattern($httpHost, $serverName, $isAllowed, $serverPort = '80', $ssl = 'Off')
    {
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['trustedHostsPattern'] = GeneralUtility::ENV_TRUSTED_HOSTS_PATTERN_SERVER_NAME;
        $_SERVER['SERVER_NAME'] = $serverName;
        $_SERVER['SERVER_PORT'] = $serverPort;
        $_SERVER['HTTPS'] = $ssl;
        $this->assertSame($isAllowed, GeneralUtilityFixture::isAllowedHostHeaderValue($httpHost));
    }

    /**
     * @test
     */
    public function allGetIndpEnvCallsRelatedToHostNamesCallIsAllowedHostHeaderValue()
    {
        GeneralUtilityFixture::getIndpEnv('HTTP_HOST');
        GeneralUtility::flushInternalRuntimeCaches();
        GeneralUtilityFixture::getIndpEnv('TYPO3_HOST_ONLY');
        GeneralUtility::flushInternalRuntimeCaches();
        GeneralUtilityFixture::getIndpEnv('TYPO3_REQUEST_HOST');
        GeneralUtility::flushInternalRuntimeCaches();
        GeneralUtilityFixture::getIndpEnv('TYPO3_REQUEST_URL');
        $this->assertSame(4, GeneralUtilityFixture::$isAllowedHostHeaderValueCallCount);
    }

    /**
     * @param string $httpHost HTTP_HOST string
     * @param string $hostNamePattern trusted hosts pattern
     * @test
     * @dataProvider hostnamesNotMatchingTrustedHostsConfigurationDataProvider
     */
    public function getIndpEnvForHostThrowsExceptionForNotAllowedHostnameValues($httpHost, $hostNamePattern)
    {
        $this->expectException(\UnexpectedValueException::class);
        $this->expectExceptionCode(1396795884);

        $_SERVER['HTTP_HOST'] = $httpHost;
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['trustedHostsPattern'] = $hostNamePattern;
        GeneralUtilityFixture::getIndpEnv('HTTP_HOST');
    }

    /**
     * @param string $httpHost HTTP_HOST string
     * @param string $hostNamePattern trusted hosts pattern (not used in this test currently)
     * @test
     * @dataProvider hostnamesNotMatchingTrustedHostsConfigurationDataProvider
     */
    public function getIndpEnvForHostAllowsAllHostnameValuesIfHostPatternIsSetToAllowAll($httpHost, $hostNamePattern)
    {
        $_SERVER['HTTP_HOST'] = $httpHost;
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['trustedHostsPattern'] = GeneralUtility::ENV_TRUSTED_HOSTS_PATTERN_ALLOW_ALL;
        $this->assertSame($httpHost, GeneralUtility::getIndpEnv('HTTP_HOST'));
    }

    /**
     * @test
     * @dataProvider hostnameAndPortDataProvider
     */
    public function getIndpEnvTypo3PortParsesHostnamesAndIpAdresses($httpHost, $dummy, $expectedPort)
    {
        $_SERVER['HTTP_HOST'] = $httpHost;
        $this->assertEquals($expectedPort, GeneralUtility::getIndpEnv('TYPO3_PORT'));
    }

    //////////////////////////////////
    // Tests concerning underscoredToUpperCamelCase
    //////////////////////////////////
    /**
     * Data provider for underscoredToUpperCamelCase
     *
     * @return array expected, input string
     */
    public function underscoredToUpperCamelCaseDataProvider()
    {
        return [
            'single word' => ['Blogexample', 'blogexample'],
            'multiple words' => ['BlogExample', 'blog_example']
        ];
    }

    /**
     * @test
     * @dataProvider underscoredToUpperCamelCaseDataProvider
     */
    public function underscoredToUpperCamelCase($expected, $inputString)
    {
        $this->assertEquals($expected, GeneralUtility::underscoredToUpperCamelCase($inputString));
    }

    //////////////////////////////////
    // Tests concerning underscoredToLowerCamelCase
    //////////////////////////////////
    /**
     * Data provider for underscoredToLowerCamelCase
     *
     * @return array expected, input string
     */
    public function underscoredToLowerCamelCaseDataProvider()
    {
        return [
            'single word' => ['minimalvalue', 'minimalvalue'],
            'multiple words' => ['minimalValue', 'minimal_value']
        ];
    }

    /**
     * @test
     * @dataProvider underscoredToLowerCamelCaseDataProvider
     */
    public function underscoredToLowerCamelCase($expected, $inputString)
    {
        $this->assertEquals($expected, GeneralUtility::underscoredToLowerCamelCase($inputString));
    }

    //////////////////////////////////
    // Tests concerning camelCaseToLowerCaseUnderscored
    //////////////////////////////////
    /**
     * Data provider for camelCaseToLowerCaseUnderscored
     *
     * @return array expected, input string
     */
    public function camelCaseToLowerCaseUnderscoredDataProvider()
    {
        return [
            'single word' => ['blogexample', 'blogexample'],
            'single word starting upper case' => ['blogexample', 'Blogexample'],
            'two words starting lower case' => ['minimal_value', 'minimalValue'],
            'two words starting upper case' => ['blog_example', 'BlogExample']
        ];
    }

    /**
     * @test
     * @dataProvider camelCaseToLowerCaseUnderscoredDataProvider
     */
    public function camelCaseToLowerCaseUnderscored($expected, $inputString)
    {
        $this->assertEquals($expected, GeneralUtility::camelCaseToLowerCaseUnderscored($inputString));
    }

    //////////////////////////////////
    // Tests concerning lcFirst
    //////////////////////////////////
    /**
     * Data provider for lcFirst
     *
     * @return array expected, input string
     */
    public function lcfirstDataProvider()
    {
        return [
            'single word' => ['blogexample', 'blogexample'],
            'single Word starting upper case' => ['blogexample', 'Blogexample'],
            'two words' => ['blogExample', 'BlogExample']
        ];
    }

    /**
     * @test
     * @dataProvider lcfirstDataProvider
     */
    public function lcFirst($expected, $inputString)
    {
        $this->assertEquals($expected, GeneralUtility::lcfirst($inputString));
    }

    //////////////////////////////////
    // Tests concerning isValidUrl
    //////////////////////////////////
    /**
     * Data provider for valid isValidUrl's
     *
     * @return array Valid resource
     */
    public function validUrlValidResourceDataProvider()
    {
        return [
            'http' => ['http://www.example.org/'],
            'http without trailing slash' => ['http://qwe'],
            'http directory with trailing slash' => ['http://www.example/img/dir/'],
            'http directory without trailing slash' => ['http://www.example/img/dir'],
            'http index.html' => ['http://example.com/index.html'],
            'http index.php' => ['http://www.example.com/index.php'],
            'http test.png' => ['http://www.example/img/test.png'],
            'http username password querystring and ancher' => ['https://user:pw@www.example.org:80/path?arg=value#fragment'],
            'file' => ['file:///tmp/test.c'],
            'file directory' => ['file://foo/bar'],
            'ftp directory' => ['ftp://ftp.example.com/tmp/'],
            'mailto' => ['mailto:foo@bar.com'],
            'news' => ['news:news.php.net'],
            'telnet' => ['telnet://192.0.2.16:80/'],
            'ldap' => ['ldap://[2001:db8::7]/c=GB?objectClass?one'],
            'http punycode domain name' => ['http://www.xn--bb-eka.at'],
            'http punicode subdomain' => ['http://xn--h-zfa.oebb.at'],
            'http domain-name umlauts' => ['http://www.öbb.at'],
            'http subdomain umlauts' => ['http://äh.oebb.at'],
        ];
    }

    /**
     * @test
     * @dataProvider validUrlValidResourceDataProvider
     */
    public function validURLReturnsTrueForValidResource($url)
    {
        $this->assertTrue(GeneralUtility::isValidUrl($url));
    }

    /**
     * Data provider for invalid isValidUrl's
     *
     * @return array Invalid ressource
     */
    public function isValidUrlInvalidRessourceDataProvider()
    {
        return [
            'http missing colon' => ['http//www.example/wrong/url/'],
            'http missing slash' => ['http:/www.example'],
            'hostname only' => ['www.example.org/'],
            'file missing protocol specification' => ['/tmp/test.c'],
            'slash only' => ['/'],
            'string http://' => ['http://'],
            'string http:/' => ['http:/'],
            'string http:' => ['http:'],
            'string http' => ['http'],
            'empty string' => [''],
            'string -1' => ['-1'],
            'string array()' => ['array()'],
            'random string' => ['qwe'],
            'http directory umlauts' => ['http://www.oebb.at/äöü/'],
        ];
    }

    /**
     * @test
     * @dataProvider isValidUrlInvalidRessourceDataProvider
     */
    public function validURLReturnsFalseForInvalidRessoure($url)
    {
        $this->assertFalse(GeneralUtility::isValidUrl($url));
    }

    //////////////////////////////////
    // Tests concerning isOnCurrentHost
    //////////////////////////////////
    /**
     * @test
     */
    public function isOnCurrentHostReturnsTrueWithCurrentHost()
    {
        $testUrl = GeneralUtility::getIndpEnv('TYPO3_REQUEST_URL');
        $this->assertTrue(GeneralUtility::isOnCurrentHost($testUrl));
    }

    /**
     * Data provider for invalid isOnCurrentHost's
     *
     * @return array Invalid Hosts
     */
    public function checkisOnCurrentHostInvalidHosts()
    {
        return [
            'empty string' => [''],
            'arbitrary string' => ['arbitrary string'],
            'localhost IP' => ['127.0.0.1'],
            'relative path' => ['./relpath/file.txt'],
            'absolute path' => ['/abspath/file.txt?arg=value'],
            'differnt host' => [GeneralUtility::getIndpEnv('TYPO3_REQUEST_HOST') . '.example.org']
        ];
    }

    ////////////////////////////////////////
    // Tests concerning sanitizeLocalUrl
    ////////////////////////////////////////
    /**
     * Data provider for valid sanitizeLocalUrl paths
     *
     * @return array Valid url
     */
    public function sanitizeLocalUrlValidPathsDataProvider()
    {
        return [
            'alt_intro.php' => ['alt_intro.php'],
            'alt_intro.php?foo=1&bar=2' => ['alt_intro.php?foo=1&bar=2'],
            '../index.php' => ['../index.php'],
            '../typo3/alt_intro.php' => ['../typo3/alt_intro.php'],
            '../~userDirectory/index.php' => ['../~userDirectory/index.php'],
            '../typo3/index.php?var1=test-case&var2=~user' => ['../typo3/index.php?var1=test-case&var2=~user'],
            PATH_site . 'typo3/alt_intro.php' => [PATH_site . 'typo3/alt_intro.php'],
        ];
    }

    /**
     * @test
     * @param string $path
     * @dataProvider sanitizeLocalUrlValidPathsDataProvider
     */
    public function sanitizeLocalUrlAcceptsNotEncodedValidPaths($path)
    {
        $this->assertEquals($path, GeneralUtility::sanitizeLocalUrl($path));
    }

    /**
     * @test
     * @param string $path
     * @dataProvider sanitizeLocalUrlValidPathsDataProvider
     */
    public function sanitizeLocalUrlAcceptsEncodedValidPaths($path)
    {
        $this->assertEquals(rawurlencode($path), GeneralUtility::sanitizeLocalUrl(rawurlencode($path)));
    }

    /**
     * Data provider for valid sanitizeLocalUrl's
     *
     * @return array Valid url
     */
    public function sanitizeLocalUrlValidUrlsDataProvider()
    {
        $host = 'localhost';
        $subDirectory = '/cms/';

        return [
            $subDirectory . 'typo3/alt_intro.php' => [
                $subDirectory . 'typo3/alt_intro.php',
                $host,
                $subDirectory,
            ],
            $subDirectory . 'index.php' => [
                $subDirectory . 'index.php',
                $host,
                $subDirectory,
            ],
            'http://' . $host . '/typo3/alt_intro.php' => [
                'http://' . $host . '/typo3/alt_intro.php',
                $host,
                '',
            ],
            'http://' . $host . $subDirectory . 'typo3/alt_intro.php' => [
                'http://' . $host . $subDirectory . 'typo3/alt_intro.php',
                $host,
                $subDirectory,
            ],
        ];
    }

    /**
     * @test
     * @param string $url
     * @param string $host
     * @param string $subDirectory
     * @dataProvider sanitizeLocalUrlValidUrlsDataProvider
     */
    public function sanitizeLocalUrlAcceptsNotEncodedValidUrls($url, $host, $subDirectory)
    {
        $_SERVER['HTTP_HOST'] = $host;
        $_SERVER['SCRIPT_NAME'] = $subDirectory . 'typo3/index.php';
        GeneralUtility::flushInternalRuntimeCaches();
        $this->assertEquals($url, GeneralUtility::sanitizeLocalUrl($url));
    }

    /**
     * @test
     * @param string $url
     * @param string $host
     * @param string $subDirectory
     * @dataProvider sanitizeLocalUrlValidUrlsDataProvider
     */
    public function sanitizeLocalUrlAcceptsEncodedValidUrls($url, $host, $subDirectory)
    {
        $_SERVER['HTTP_HOST'] = $host;
        $_SERVER['SCRIPT_NAME'] = $subDirectory . 'typo3/index.php';
        GeneralUtility::flushInternalRuntimeCaches();
        $this->assertEquals(rawurlencode($url), GeneralUtility::sanitizeLocalUrl(rawurlencode($url)));
    }

    /**
     * Data provider for invalid sanitizeLocalUrl's
     *
     * @return array Valid url
     */
    public function sanitizeLocalUrlInvalidDataProvider()
    {
        return [
            'empty string' => [''],
            'http domain' => ['http://www.google.de/'],
            'https domain' => ['https://www.google.de/'],
            'XSS attempt' => ['" onmouseover="alert(123)"'],
            'invalid URL, UNC path' => ['\\\\foo\\bar\\'],
            'invalid URL, HTML break out attempt' => ['" >blabuubb'],
            'base64 encoded string' => ['data:%20text/html;base64,PHNjcmlwdD5hbGVydCgnWFNTJyk8L3NjcmlwdD4='],
        ];
    }

    /**
     * @test
     * @dataProvider sanitizeLocalUrlInvalidDataProvider
     */
    public function sanitizeLocalUrlDeniesPlainInvalidUrls($url)
    {
        $this->assertEquals('', GeneralUtility::sanitizeLocalUrl($url));
    }

    /**
     * @test
     * @dataProvider sanitizeLocalUrlInvalidDataProvider
     */
    public function sanitizeLocalUrlDeniesEncodedInvalidUrls($url)
    {
        $this->assertEquals('', GeneralUtility::sanitizeLocalUrl(rawurlencode($url)));
    }

    ////////////////////////////////////////
    // Tests concerning unlink_tempfile
    ////////////////////////////////////////

    /**
     * @test
     */
    public function unlink_tempfileRemovesValidFileInTypo3temp()
    {
        $fixtureFile = __DIR__ . '/Fixtures/clear.gif';
        $testFilename = PATH_site . 'typo3temp/var/tests/' . $this->getUniqueId('test_') . '.gif';
        @copy($fixtureFile, $testFilename);
        GeneralUtility::unlink_tempfile($testFilename);
        $fileExists = file_exists($testFilename);
        $this->assertFalse($fileExists);
    }

    /**
     * @test
     */
    public function unlink_tempfileRemovesHiddenFile()
    {
        $fixtureFile = __DIR__ . '/Fixtures/clear.gif';
        $testFilename = PATH_site . 'typo3temp/var/tests/' . $this->getUniqueId('.test_') . '.gif';
        @copy($fixtureFile, $testFilename);
        GeneralUtility::unlink_tempfile($testFilename);
        $fileExists = file_exists($testFilename);
        $this->assertFalse($fileExists);
    }

    /**
     * @test
     */
    public function unlink_tempfileReturnsTrueIfFileWasRemoved()
    {
        $fixtureFile = __DIR__ . '/Fixtures/clear.gif';
        $testFilename = PATH_site . 'typo3temp/var/tests/' . $this->getUniqueId('test_') . '.gif';
        @copy($fixtureFile, $testFilename);
        $returnValue = GeneralUtility::unlink_tempfile($testFilename);
        $this->assertTrue($returnValue);
    }

    /**
     * @test
     */
    public function unlink_tempfileReturnsNullIfFileDoesNotExist()
    {
        $returnValue = GeneralUtility::unlink_tempfile(PATH_site . 'typo3temp/var/tests/' . $this->getUniqueId('i_do_not_exist'));
        $this->assertNull($returnValue);
    }

    /**
     * @test
     */
    public function unlink_tempfileReturnsNullIfFileIsNowWithinTypo3temp()
    {
        $returnValue = GeneralUtility::unlink_tempfile('/tmp/typo3-unit-test-unlink_tempfile');
        $this->assertNull($returnValue);
    }

    //////////////////////////////////////
    // Tests concerning tempnam
    //////////////////////////////////////

    /**
     * @test
     */
    public function tempnamReturnsPathStartingWithGivenPrefix()
    {
        $filePath = GeneralUtility::tempnam('foo');
        $this->testFilesToDelete[] = $filePath;
        $fileName = basename($filePath);
        $this->assertStringStartsWith('foo', $fileName);
    }

    /**
     * @test
     */
    public function tempnamReturnsPathWithoutBackslashes()
    {
        $filePath = GeneralUtility::tempnam('foo');
        $this->testFilesToDelete[] = $filePath;
        $this->assertNotContains('\\', $filePath);
    }

    /**
     * @test
     */
    public function tempnamReturnsAbsolutePathInsideDocumentRoot()
    {
        $filePath = GeneralUtility::tempnam('foo');
        $this->testFilesToDelete[] = $filePath;
        $this->assertStringStartsWith(PATH_site, $filePath);
    }

    //////////////////////////////////////
    // Tests concerning removeDotsFromTS
    //////////////////////////////////////
    /**
     * @test
     */
    public function removeDotsFromTypoScriptSucceedsWithDottedArray()
    {
        $typoScript = [
            'propertyA.' => [
                'keyA.' => [
                    'valueA' => 1
                ],
                'keyB' => 2
            ],
            'propertyB' => 3
        ];
        $expectedResult = [
            'propertyA' => [
                'keyA' => [
                    'valueA' => 1
                ],
                'keyB' => 2
            ],
            'propertyB' => 3
        ];
        $this->assertEquals($expectedResult, GeneralUtility::removeDotsFromTS($typoScript));
    }

    /**
     * @test
     */
    public function removeDotsFromTypoScriptOverridesSubArray()
    {
        $typoScript = [
            'propertyA.' => [
                'keyA' => 'getsOverridden',
                'keyA.' => [
                    'valueA' => 1
                ],
                'keyB' => 2
            ],
            'propertyB' => 3
        ];
        $expectedResult = [
            'propertyA' => [
                'keyA' => [
                    'valueA' => 1
                ],
                'keyB' => 2
            ],
            'propertyB' => 3
        ];
        $this->assertEquals($expectedResult, GeneralUtility::removeDotsFromTS($typoScript));
    }

    /**
     * @test
     */
    public function removeDotsFromTypoScriptOverridesWithScalar()
    {
        $typoScript = [
            'propertyA.' => [
                'keyA.' => [
                    'valueA' => 1
                ],
                'keyA' => 'willOverride',
                'keyB' => 2
            ],
            'propertyB' => 3
        ];
        $expectedResult = [
            'propertyA' => [
                'keyA' => 'willOverride',
                'keyB' => 2
            ],
            'propertyB' => 3
        ];
        $this->assertEquals($expectedResult, GeneralUtility::removeDotsFromTS($typoScript));
    }

    //////////////////////////////////////
    // Tests concerning get_dirs
    //////////////////////////////////////
    /**
     * @test
     */
    public function getDirsReturnsArrayOfDirectoriesFromGivenDirectory()
    {
        $path = PATH_typo3conf;
        $directories = GeneralUtility::get_dirs($path);
        $this->assertInternalType(\PHPUnit_Framework_Constraint_IsType::TYPE_ARRAY, $directories);
    }

    /**
     * @test
     */
    public function getDirsReturnsStringErrorOnPathFailure()
    {
        $path = 'foo';
        $result = GeneralUtility::get_dirs($path);
        $expectedResult = 'error';
        $this->assertEquals($expectedResult, $result);
    }

    //////////////////////////////////
    // Tests concerning hmac
    //////////////////////////////////
    /**
     * @test
     */
    public function hmacReturnsHashOfProperLength()
    {
        $hmac = GeneralUtility::hmac('message');
        $this->assertTrue(!empty($hmac) && is_string($hmac));
        $this->assertTrue(strlen($hmac) == 40);
    }

    /**
     * @test
     */
    public function hmacReturnsEqualHashesForEqualInput()
    {
        $msg0 = 'message';
        $msg1 = 'message';
        $this->assertEquals(GeneralUtility::hmac($msg0), GeneralUtility::hmac($msg1));
    }

    /**
     * @test
     */
    public function hmacReturnsNoEqualHashesForNonEqualInput()
    {
        $msg0 = 'message0';
        $msg1 = 'message1';
        $this->assertNotEquals(GeneralUtility::hmac($msg0), GeneralUtility::hmac($msg1));
    }

    //////////////////////////////////
    // Tests concerning quoteJSvalue
    //////////////////////////////////
    /**
     * Data provider for quoteJSvalueTest.
     *
     * @return array
     */
    public function quoteJsValueDataProvider()
    {
        return [
            'Immune characters are returned as is' => [
                '._,',
                '._,'
            ],
            'Alphanumerical characters are returned as is' => [
                'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789',
                'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
            ],
            'Angle brackets and ampersand are encoded' => [
                '<>&',
                '\\u003C\\u003E\\u0026'
            ],
            'Quotes and backslashes are encoded' => [
                '"\'\\',
                '\\u0022\\u0027\\u005C'
            ],
            'Forward slashes are escaped' => [
                '</script>',
                '\\u003C\\/script\\u003E'
            ],
            'Empty string stays empty' => [
                '',
                ''
            ],
            'Exclamation mark and space are properly encoded' => [
                'Hello World!',
                'Hello\\u0020World\\u0021'
            ],
            'Whitespaces are properly encoded' => [
                TAB . LF . CR . ' ',
                '\\u0009\\u000A\\u000D\\u0020'
            ],
            'Null byte is properly encoded' => [
                chr(0),
                '\\u0000'
            ],
            'Umlauts are properly encoded' => [
                'ÜüÖöÄä',
                '\\u00dc\\u00fc\\u00d6\\u00f6\\u00c4\\u00e4'
            ]
        ];
    }

    /**
     * @test
     * @param string $input
     * @param string $expected
     * @dataProvider quoteJsValueDataProvider
     */
    public function quoteJsValueTest($input, $expected)
    {
        $this->assertSame('\'' . $expected . '\'', GeneralUtility::quoteJSvalue($input));
    }

    ///////////////////////////////
    // Tests concerning _GETset()
    ///////////////////////////////
    /**
     * @test
     */
    public function getSetWritesArrayToGetSystemVariable()
    {
        $_GET = [];
        $GLOBALS['HTTP_GET_VARS'] = [];
        $getParameters = ['foo' => 'bar'];
        GeneralUtility::_GETset($getParameters);
        $this->assertSame($getParameters, $_GET);
    }

    /**
     * @test
     */
    public function getSetWritesArrayToGlobalsHttpGetVars()
    {
        $_GET = [];
        $GLOBALS['HTTP_GET_VARS'] = [];
        $getParameters = ['foo' => 'bar'];
        GeneralUtility::_GETset($getParameters);
        $this->assertSame($getParameters, $GLOBALS['HTTP_GET_VARS']);
    }

    /**
     * @test
     */
    public function getSetForArrayDropsExistingValues()
    {
        $_GET = [];
        $GLOBALS['HTTP_GET_VARS'] = [];
        GeneralUtility::_GETset(['foo' => 'bar']);
        GeneralUtility::_GETset(['oneKey' => 'oneValue']);
        $this->assertEquals(['oneKey' => 'oneValue'], $GLOBALS['HTTP_GET_VARS']);
    }

    /**
     * @test
     */
    public function getSetAssignsOneValueToOneKey()
    {
        $_GET = [];
        $GLOBALS['HTTP_GET_VARS'] = [];
        GeneralUtility::_GETset('oneValue', 'oneKey');
        $this->assertEquals('oneValue', $GLOBALS['HTTP_GET_VARS']['oneKey']);
    }

    /**
     * @test
     */
    public function getSetForOneValueDoesNotDropUnrelatedValues()
    {
        $_GET = [];
        $GLOBALS['HTTP_GET_VARS'] = [];
        GeneralUtility::_GETset(['foo' => 'bar']);
        GeneralUtility::_GETset('oneValue', 'oneKey');
        $this->assertEquals(['foo' => 'bar', 'oneKey' => 'oneValue'], $GLOBALS['HTTP_GET_VARS']);
    }

    /**
     * @test
     */
    public function getSetCanAssignsAnArrayToASpecificArrayElement()
    {
        $_GET = [];
        $GLOBALS['HTTP_GET_VARS'] = [];
        GeneralUtility::_GETset(['childKey' => 'oneValue'], 'parentKey');
        $this->assertEquals(['parentKey' => ['childKey' => 'oneValue']], $GLOBALS['HTTP_GET_VARS']);
    }

    /**
     * @test
     */
    public function getSetCanAssignAStringValueToASpecificArrayChildElement()
    {
        $_GET = [];
        $GLOBALS['HTTP_GET_VARS'] = [];
        GeneralUtility::_GETset('oneValue', 'parentKey|childKey');
        $this->assertEquals(['parentKey' => ['childKey' => 'oneValue']], $GLOBALS['HTTP_GET_VARS']);
    }

    /**
     * @test
     */
    public function getSetCanAssignAnArrayToASpecificArrayChildElement()
    {
        $_GET = [];
        $GLOBALS['HTTP_GET_VARS'] = [];
        GeneralUtility::_GETset(['key1' => 'value1', 'key2' => 'value2'], 'parentKey|childKey');
        $this->assertEquals([
            'parentKey' => [
                'childKey' => ['key1' => 'value1', 'key2' => 'value2']
            ]
        ], $GLOBALS['HTTP_GET_VARS']);
    }

    ///////////////////////////
    // Tests concerning minifyJavaScript
    ///////////////////////////
    /**
     * @test
     */
    public function minifyJavaScriptReturnsInputStringIfNoHookIsRegistered()
    {
        unset($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_div.php']['minifyJavaScript']);
        $testString = $this->getUniqueId('string');
        $this->assertSame($testString, GeneralUtility::minifyJavaScript($testString));
    }

    /**
     * Create an own hook callback class, register as hook, and check
     * if given string to compress is given to hook method
     *
     * @test
     */
    public function minifyJavaScriptCallsRegisteredHookWithInputString()
    {
        $hookClassName = $this->getUniqueId('tx_coretest');
        $minifyHookMock = $this->getMockBuilder('stdClass')
            ->setMethods(['minify'])
            ->setMockClassName($hookClassName)
            ->getMock();
        $functionName = $hookClassName . '->minify';
        $GLOBALS['T3_VAR']['callUserFunction'][$functionName] = [];
        $GLOBALS['T3_VAR']['callUserFunction'][$functionName]['obj'] = $minifyHookMock;
        $GLOBALS['T3_VAR']['callUserFunction'][$functionName]['method'] = 'minify';
        $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_div.php']['minifyJavaScript'][] = $functionName;
        $minifyHookMock->expects($this->once())->method('minify')->will($this->returnCallback([$this, 'isMinifyJavaScriptHookCalledCallback']));
        GeneralUtility::minifyJavaScript('foo');
    }

    /**
     * Callback function used in minifyJavaScriptCallsRegisteredHookWithInputString test
     *
     * @param array $params
     */
    public function isMinifyJavaScriptHookCalledCallback(array $params)
    {
        // We can not throw an exception here, because that would be caught by the
        // minifyJavaScript method under test itself. Thus, we just die if the
        // input string is not ok.
        if ($params['script'] !== 'foo') {
            die('broken');
        }
    }

    /**
     * Create a hook callback, use callback to throw an exception and check
     * if the exception is given as error parameter to the calling method.
     *
     * @test
     */
    public function minifyJavaScriptReturnsErrorStringOfHookException()
    {
        $hookClassName = $this->getUniqueId('tx_coretest');
        $minifyHookMock = $this->getMockBuilder('stdClass')
            ->setMethods(['minify'])
            ->setMockClassName($hookClassName)
            ->getMock();
        $functionName = '&' . $hookClassName . '->minify';
        $GLOBALS['T3_VAR']['callUserFunction'][$functionName] = [];
        $GLOBALS['T3_VAR']['callUserFunction'][$functionName]['obj'] = $minifyHookMock;
        $GLOBALS['T3_VAR']['callUserFunction'][$functionName]['method'] = 'minify';
        $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_div.php']['minifyJavaScript'][] = $functionName;
        $minifyHookMock->expects($this->any())->method('minify')->will($this->returnCallback([$this, 'minifyJavaScriptErroneousCallback']));
        $error = '';
        GeneralUtility::minifyJavaScript('string to compress', $error);
        $this->assertSame('Error minifying java script: foo', $error);
    }

    /**
     * Check if the error message that is returned by the hook callback
     * is logged to \TYPO3\CMS\Core\GeneralUtility::devLog.
     *
     * @test
     */
    public function minifyJavaScriptWritesExceptionMessageToDevLog()
    {
        $hookClassName = $this->getUniqueId('tx_coretest');
        $minifyHookMock = $this->getMockBuilder('stdClass')
            ->setMethods(['minify'])
            ->setMockClassName($hookClassName)
            ->getMock();
        $functionName = '&' . $hookClassName . '->minify';
        $GLOBALS['T3_VAR']['callUserFunction'][$functionName] = [];
        $GLOBALS['T3_VAR']['callUserFunction'][$functionName]['obj'] = $minifyHookMock;
        $GLOBALS['T3_VAR']['callUserFunction'][$functionName]['method'] = 'minify';
        $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_div.php']['minifyJavaScript'][] = $functionName;
        $minifyHookMock->expects($this->any())->method('minify')->will($this->returnCallback([$this, 'minifyJavaScriptErroneousCallback']));
        $this->expectException(\RuntimeException::class);
        GeneralUtilityMinifyJavaScriptFixture::minifyJavaScript('string to compress');
    }

    /**
     * Callback function used in
     * minifyJavaScriptReturnsErrorStringOfHookException and
     * minifyJavaScriptWritesExceptionMessageToDevLog
     *
     * @throws \RuntimeException
     */
    public function minifyJavaScriptErroneousCallback()
    {
        throw new \RuntimeException('foo', 1344888548);
    }

    ///////////////////////////////
    // Tests concerning fixPermissions
    ///////////////////////////////
    /**
     * @test
     */
    public function fixPermissionsSetsGroup()
    {
        if (TYPO3_OS === 'WIN') {
            $this->markTestSkipped(self::NO_FIX_PERMISSIONS_ON_WINDOWS);
        }
        if (!function_exists('posix_getegid')) {
            $this->markTestSkipped('Function posix_getegid() not available, fixPermissionsSetsGroup() tests skipped');
        }
        if (posix_getegid() === -1) {
            $this->markTestSkipped('The fixPermissionsSetsGroup() is not available on Mac OS because posix_getegid() always returns -1 on Mac OS.');
        }
        // Create and prepare test file
        $filename = $this->getVirtualTestDir() . '/' . $this->getUniqueId('test_');
        GeneralUtilityFilesystemFixture::writeFileToTypo3tempDir($filename, '42');
        $currentGroupId = posix_getegid();
        // Set target group and run method
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['createGroup'] = $currentGroupId;
        GeneralUtilityFilesystemFixture::fixPermissions($filename);
        clearstatcache();
        $this->assertEquals($currentGroupId, filegroup($filename));
    }

    /**
     * @test
     */
    public function fixPermissionsSetsPermissionsToFile()
    {
        if (TYPO3_OS === 'WIN') {
            $this->markTestSkipped(self::NO_FIX_PERMISSIONS_ON_WINDOWS);
        }
        // Create and prepare test file
        $filename = $this->getVirtualTestDir() . '/' . $this->getUniqueId('test_');
        GeneralUtilityFilesystemFixture::writeFileToTypo3tempDir($filename, '42');
        chmod($filename, 482);
        // Set target permissions and run method
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['fileCreateMask'] = '0660';
        $fixPermissionsResult = GeneralUtilityFilesystemFixture::fixPermissions($filename);
        clearstatcache();
        $this->assertTrue($fixPermissionsResult);
        $this->assertEquals('0660', substr(decoct(fileperms($filename)), 2));
    }

    /**
     * @test
     */
    public function fixPermissionsSetsPermissionsToHiddenFile()
    {
        if (TYPO3_OS === 'WIN') {
            $this->markTestSkipped(self::NO_FIX_PERMISSIONS_ON_WINDOWS);
        }
        // Create and prepare test file
        $filename = $this->getVirtualTestDir() . '/' . $this->getUniqueId('test_');
        GeneralUtilityFilesystemFixture::writeFileToTypo3tempDir($filename, '42');
        chmod($filename, 482);
        // Set target permissions and run method
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['fileCreateMask'] = '0660';
        $fixPermissionsResult = GeneralUtilityFilesystemFixture::fixPermissions($filename);
        clearstatcache();
        $this->assertTrue($fixPermissionsResult);
        $this->assertEquals('0660', substr(decoct(fileperms($filename)), 2));
    }

    /**
     * @test
     */
    public function fixPermissionsSetsPermissionsToDirectory()
    {
        if (TYPO3_OS === 'WIN') {
            $this->markTestSkipped(self::NO_FIX_PERMISSIONS_ON_WINDOWS);
        }
        // Create and prepare test directory
        $directory = $this->getVirtualTestDir() . '/' . $this->getUniqueId('test_');
        GeneralUtilityFilesystemFixture::mkdir($directory);
        chmod($directory, 1551);
        // Set target permissions and run method
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['folderCreateMask'] = '0770';
        $fixPermissionsResult = GeneralUtilityFilesystemFixture::fixPermissions($directory);
        clearstatcache();
        $this->assertTrue($fixPermissionsResult);
        $this->assertEquals('0770', substr(decoct(fileperms($directory)), 1));
    }

    /**
     * @test
     */
    public function fixPermissionsSetsPermissionsToDirectoryWithTrailingSlash()
    {
        if (TYPO3_OS === 'WIN') {
            $this->markTestSkipped(self::NO_FIX_PERMISSIONS_ON_WINDOWS);
        }
        // Create and prepare test directory
        $directory = $this->getVirtualTestDir() . '/' . $this->getUniqueId('test_');
        GeneralUtilityFilesystemFixture::mkdir($directory);
        chmod($directory, 1551);
        // Set target permissions and run method
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['folderCreateMask'] = '0770';
        $fixPermissionsResult = GeneralUtilityFilesystemFixture::fixPermissions($directory . '/');
        // Get actual permissions and clean up
        clearstatcache();
        $this->assertTrue($fixPermissionsResult);
        $this->assertEquals('0770', substr(decoct(fileperms($directory)), 1));
    }

    /**
     * @test
     */
    public function fixPermissionsSetsPermissionsToHiddenDirectory()
    {
        if (TYPO3_OS === 'WIN') {
            $this->markTestSkipped(self::NO_FIX_PERMISSIONS_ON_WINDOWS);
        }
        // Create and prepare test directory
        $directory = $this->getVirtualTestDir() . '/' . $this->getUniqueId('test_');
        GeneralUtilityFilesystemFixture::mkdir($directory);
        chmod($directory, 1551);
        // Set target permissions and run method
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['folderCreateMask'] = '0770';
        $fixPermissionsResult = GeneralUtilityFilesystemFixture::fixPermissions($directory);
        // Get actual permissions and clean up
        clearstatcache();
        $this->assertTrue($fixPermissionsResult);
        $this->assertEquals('0770', substr(decoct(fileperms($directory)), 1));
    }

    /**
     * @test
     */
    public function fixPermissionsCorrectlySetsPermissionsRecursive()
    {
        if (TYPO3_OS === 'WIN') {
            $this->markTestSkipped(self::NO_FIX_PERMISSIONS_ON_WINDOWS);
        }
        // Create and prepare test directory and file structure
        $baseDirectory = $this->getVirtualTestDir() . '/' . $this->getUniqueId('test_');
        GeneralUtilityFilesystemFixture::mkdir($baseDirectory);
        chmod($baseDirectory, 1751);
        GeneralUtilityFilesystemFixture::writeFileToTypo3tempDir($baseDirectory . '/file', '42');
        chmod($baseDirectory . '/file', 482);
        GeneralUtilityFilesystemFixture::mkdir($baseDirectory . '/foo');
        chmod($baseDirectory . '/foo', 1751);
        GeneralUtilityFilesystemFixture::writeFileToTypo3tempDir($baseDirectory . '/foo/file', '42');
        chmod($baseDirectory . '/foo/file', 482);
        GeneralUtilityFilesystemFixture::mkdir($baseDirectory . '/.bar');
        chmod($baseDirectory . '/.bar', 1751);
        // Use this if writeFileToTypo3tempDir is fixed to create hidden files in subdirectories
        // \TYPO3\CMS\Core\Utility\GeneralUtility::writeFileToTypo3tempDir($baseDirectory . '/.bar/.file', '42');
        // \TYPO3\CMS\Core\Utility\GeneralUtility::writeFileToTypo3tempDir($baseDirectory . '/.bar/..file2', '42');
        touch($baseDirectory . '/.bar/.file', '42');
        chmod($baseDirectory . '/.bar/.file', 482);
        touch($baseDirectory . '/.bar/..file2', '42');
        chmod($baseDirectory . '/.bar/..file2', 482);
        // Set target permissions and run method
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['fileCreateMask'] = '0660';
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['folderCreateMask'] = '0770';
        $fixPermissionsResult = GeneralUtilityFilesystemFixture::fixPermissions($baseDirectory, true);
        // Get actual permissions
        clearstatcache();
        $resultBaseDirectoryPermissions = substr(decoct(fileperms($baseDirectory)), 1);
        $resultBaseFilePermissions = substr(decoct(fileperms($baseDirectory . '/file')), 2);
        $resultFooDirectoryPermissions = substr(decoct(fileperms($baseDirectory . '/foo')), 1);
        $resultFooFilePermissions = substr(decoct(fileperms($baseDirectory . '/foo/file')), 2);
        $resultBarDirectoryPermissions = substr(decoct(fileperms($baseDirectory . '/.bar')), 1);
        $resultBarFilePermissions = substr(decoct(fileperms($baseDirectory . '/.bar/.file')), 2);
        $resultBarFile2Permissions = substr(decoct(fileperms($baseDirectory . '/.bar/..file2')), 2);
        // Test if everything was ok
        $this->assertTrue($fixPermissionsResult);
        $this->assertEquals('0770', $resultBaseDirectoryPermissions);
        $this->assertEquals('0660', $resultBaseFilePermissions);
        $this->assertEquals('0770', $resultFooDirectoryPermissions);
        $this->assertEquals('0660', $resultFooFilePermissions);
        $this->assertEquals('0770', $resultBarDirectoryPermissions);
        $this->assertEquals('0660', $resultBarFilePermissions);
        $this->assertEquals('0660', $resultBarFile2Permissions);
    }

    /**
     * @test
     */
    public function fixPermissionsDoesNotSetPermissionsToNotAllowedPath()
    {
        if (TYPO3_OS === 'WIN') {
            $this->markTestSkipped(self::NO_FIX_PERMISSIONS_ON_WINDOWS);
        }
        // Create and prepare test file
        $filename = PATH_site . 'typo3temp/var/tests/../../../typo3temp/var/tests/' . $this->getUniqueId('test_');
        // Set target permissions and run method
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['fileCreateMask'] = '0660';
        $fixPermissionsResult = GeneralUtility::fixPermissions($filename);
        $this->assertFalse($fixPermissionsResult);
    }

    /**
     * @test
     */
    public function fixPermissionsSetsPermissionsWithRelativeFileReference()
    {
        if (TYPO3_OS === 'WIN') {
            $this->markTestSkipped(self::NO_FIX_PERMISSIONS_ON_WINDOWS);
        }
        $filename = 'typo3temp/var/tests/' . $this->getUniqueId('test_');
        GeneralUtility::writeFileToTypo3tempDir(PATH_site . $filename, '42');
        $this->testFilesToDelete[] = PATH_site . $filename;
        chmod(PATH_site . $filename, 482);
        // Set target permissions and run method
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['fileCreateMask'] = '0660';
        $fixPermissionsResult = GeneralUtility::fixPermissions($filename);
        clearstatcache();
        $this->assertTrue($fixPermissionsResult);
        $this->assertEquals('0660', substr(decoct(fileperms(PATH_site . $filename)), 2));
    }

    /**
     * @test
     */
    public function fixPermissionsSetsDefaultPermissionsToFile()
    {
        if (TYPO3_OS === 'WIN') {
            $this->markTestSkipped(self::NO_FIX_PERMISSIONS_ON_WINDOWS);
        }
        $filename = $this->getVirtualTestDir() . '/' . $this->getUniqueId('test_');
        GeneralUtilityFilesystemFixture::writeFileToTypo3tempDir($filename, '42');
        chmod($filename, 482);
        unset($GLOBALS['TYPO3_CONF_VARS']['SYS']['fileCreateMask']);
        $fixPermissionsResult = GeneralUtilityFilesystemFixture::fixPermissions($filename);
        clearstatcache();
        $this->assertTrue($fixPermissionsResult);
        $this->assertEquals('0644', substr(decoct(fileperms($filename)), 2));
    }

    /**
     * @test
     */
    public function fixPermissionsSetsDefaultPermissionsToDirectory()
    {
        if (TYPO3_OS === 'WIN') {
            $this->markTestSkipped(self::NO_FIX_PERMISSIONS_ON_WINDOWS);
        }
        $directory = $this->getVirtualTestDir() . '/' . $this->getUniqueId('test_');
        GeneralUtilityFilesystemFixture::mkdir($directory);
        chmod($directory, 1551);
        unset($GLOBALS['TYPO3_CONF_VARS']['SYS']['folderCreateMask']);
        $fixPermissionsResult = GeneralUtilityFilesystemFixture::fixPermissions($directory);
        clearstatcache();
        $this->assertTrue($fixPermissionsResult);
        $this->assertEquals('0755', substr(decoct(fileperms($directory)), 1));
    }

    ///////////////////////////////
    // Tests concerning mkdir
    ///////////////////////////////
    /**
     * @test
     */
    public function mkdirCreatesDirectory()
    {
        $directory = $this->getVirtualTestDir() . '/' . $this->getUniqueId('test_');
        $mkdirResult = GeneralUtilityFilesystemFixture::mkdir($directory);
        clearstatcache();
        $this->assertTrue($mkdirResult);
        $this->assertTrue(is_dir($directory));
    }

    /**
     * @test
     */
    public function mkdirCreatesHiddenDirectory()
    {
        $directory = $this->getVirtualTestDir() . '/' . $this->getUniqueId('.test_');
        $mkdirResult = GeneralUtilityFilesystemFixture::mkdir($directory);
        clearstatcache();
        $this->assertTrue($mkdirResult);
        $this->assertTrue(is_dir($directory));
    }

    /**
     * @test
     */
    public function mkdirCreatesDirectoryWithTrailingSlash()
    {
        $directory = $this->getVirtualTestDir() . '/' . $this->getUniqueId('test_') . '/';
        $mkdirResult = GeneralUtilityFilesystemFixture::mkdir($directory);
        clearstatcache();
        $this->assertTrue($mkdirResult);
        $this->assertTrue(is_dir($directory));
    }

    /**
     * @test
     */
    public function mkdirSetsPermissionsOfCreatedDirectory()
    {
        if (TYPO3_OS === 'WIN') {
            $this->markTestSkipped(self::NO_FIX_PERMISSIONS_ON_WINDOWS);
        }
        $directory = $this->getVirtualTestDir() . '/' . $this->getUniqueId('test_');
        $oldUmask = umask(19);
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['folderCreateMask'] = '0772';
        GeneralUtilityFilesystemFixture::mkdir($directory);
        clearstatcache();
        $resultDirectoryPermissions = substr(decoct(fileperms($directory)), 1);
        umask($oldUmask);
        $this->assertEquals($resultDirectoryPermissions, '0772');
    }

    /**
     * @test
     */
    public function mkdirSetsGroupOwnershipOfCreatedDirectory()
    {
        $swapGroup = $this->checkGroups(__FUNCTION__);
        if ($swapGroup !== false) {
            $GLOBALS['TYPO3_CONF_VARS']['SYS']['createGroup'] = $swapGroup;
            $directory = $this->getVirtualTestDir() . '/' . $this->getUniqueId('mkdirtest_');
            GeneralUtilityFilesystemFixture::mkdir($directory);
            clearstatcache();
            $resultDirectoryGroup = filegroup($directory);
            $this->assertEquals($resultDirectoryGroup, $swapGroup);
        }
    }

    ///////////////////////////////
    // Helper function for filesystem ownership tests
    ///////////////////////////////
    /**
     * Check if test on filesystem group ownership can be done in this environment
     * If so, return second group of webserver user
     *
     * @param string $methodName calling method name
     * @return mixed FALSE if test cannot be run, int group id of the second group of webserver user
     */
    private function checkGroups($methodName)
    {
        if (TYPO3_OS === 'WIN') {
            $this->markTestSkipped(self::NO_FIX_PERMISSIONS_ON_WINDOWS);
            return false;
        }
        if (!function_exists('posix_getegid')) {
            $this->markTestSkipped('Function posix_getegid() not available, ' . $methodName . '() tests skipped');
            return false;
        }
        if (posix_getegid() === -1) {
            $this->markTestSkipped('Function posix_getegid() returns -1, ' . $methodName . '() tests skipped');
            return false;
        }
        if (!function_exists('posix_getgroups')) {
            $this->markTestSkipped('Function posix_getgroups() not available, ' . $methodName . '() tests skipped');
            return false;
        }
        $groups = posix_getgroups();
        if (count($groups) <= 1) {
            $this->markTestSkipped($methodName . '() test cannot be done when the web server user is only member of 1 group.');
            return false;
        }
        $secondaryGroups = array_diff($groups, [posix_getegid()]);
        return array_shift($secondaryGroups);
    }

    ///////////////////////////////
    // Tests concerning mkdir_deep
    ///////////////////////////////
    /**
     * @test
     */
    public function mkdirDeepCreatesDirectory()
    {
        $directory = $this->getVirtualTestDir() . '/' . $this->getUniqueId('test_');
        GeneralUtility::mkdir_deep($directory);
        $this->assertTrue(is_dir($directory));
    }

    /**
     * @test
     */
    public function mkdirDeepCreatesSubdirectoriesRecursive()
    {
        $directory = $this->getVirtualTestDir() . 'typo3temp/var/tests/' . $this->getUniqueId('test_');
        $subDirectory = $directory . '/foo';
        GeneralUtility::mkdir_deep($subDirectory);
        $this->assertTrue(is_dir($subDirectory));
    }

    /**
     * Data provider for mkdirDeepCreatesDirectoryWithDoubleSlashes.
     * @return array
     */
    public function mkdirDeepCreatesDirectoryWithAndWithoutDoubleSlashesDataProvider()
    {
        return [
            'no double slash if concatenated with PATH_site' => ['fileadmin/testDir1'],
            'double slash if concatenated with PATH_site' => ['/fileadmin/testDir2'],
        ];
    }

    /**
     * @test
     * @dataProvider mkdirDeepCreatesDirectoryWithAndWithoutDoubleSlashesDataProvider
     */
    public function mkdirDeepCreatesDirectoryWithDoubleSlashes($directoryToCreate)
    {
        vfsStream::setup();
        // Load fixture files and folders from disk
        FileStreamWrapper::init(PATH_site);
        FileStreamWrapper::registerOverlayPath('fileadmin', 'vfs://root/fileadmin', true);
        GeneralUtility::mkdir_deep(PATH_site, $directoryToCreate);
        $this->assertTrue(is_dir(PATH_site . $directoryToCreate));
        FileStreamWrapper::destroy();
    }

    /**
     * @test
     */
    public function mkdirDeepFixesPermissionsOfCreatedDirectory()
    {
        if (TYPO3_OS === 'WIN') {
            $this->markTestSkipped(self::NO_FIX_PERMISSIONS_ON_WINDOWS);
        }
        $directory = $this->getUniqueId('mkdirdeeptest_');
        $oldUmask = umask(19);
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['folderCreateMask'] = '0777';
        GeneralUtility::mkdir_deep(PATH_site . 'typo3temp/var/tests/', $directory);
        $this->testFilesToDelete[] = PATH_site . 'typo3temp/var/tests/' . $directory;
        clearstatcache();
        umask($oldUmask);
        $this->assertEquals('777', substr(decoct(fileperms(PATH_site . 'typo3temp/var/tests/' . $directory)), -3, 3));
    }

    /**
     * @test
     */
    public function mkdirDeepFixesPermissionsOnNewParentDirectory()
    {
        if (TYPO3_OS === 'WIN') {
            $this->markTestSkipped(self::NO_FIX_PERMISSIONS_ON_WINDOWS);
        }
        $directory = $this->getUniqueId('mkdirdeeptest_');
        $subDirectory = $directory . '/bar';
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['folderCreateMask'] = '0777';
        $oldUmask = umask(19);
        GeneralUtility::mkdir_deep(PATH_site . 'typo3temp/var/tests/', $subDirectory);
        $this->testFilesToDelete[] = PATH_site . 'typo3temp/var/tests/' . $directory;
        clearstatcache();
        umask($oldUmask);
        $this->assertEquals('777', substr(decoct(fileperms(PATH_site . 'typo3temp/var/tests/' . $directory)), -3, 3));
    }

    /**
     * @test
     */
    public function mkdirDeepDoesNotChangePermissionsOfExistingSubDirectories()
    {
        if (TYPO3_OS === 'WIN') {
            $this->markTestSkipped(self::NO_FIX_PERMISSIONS_ON_WINDOWS);
        }
        $baseDirectory = PATH_site . 'typo3temp/var/tests/';
        $existingDirectory = $this->getUniqueId('test_existing_') . '/';
        $newSubDirectory = $this->getUniqueId('test_new_');
        @mkdir(($baseDirectory . $existingDirectory));
        $this->testFilesToDelete[] = $baseDirectory . $existingDirectory;
        chmod($baseDirectory . $existingDirectory, 482);
        GeneralUtility::mkdir_deep($baseDirectory, $existingDirectory . $newSubDirectory);
        $this->assertEquals('0742', substr(decoct(fileperms($baseDirectory . $existingDirectory)), 2));
    }

    /**
     * @test
     */
    public function mkdirDeepSetsGroupOwnershipOfCreatedDirectory()
    {
        $swapGroup = $this->checkGroups(__FUNCTION__);
        if ($swapGroup !== false) {
            $GLOBALS['TYPO3_CONF_VARS']['SYS']['createGroup'] = $swapGroup;
            $directory = $this->getUniqueId('mkdirdeeptest_');
            GeneralUtility::mkdir_deep(PATH_site . 'typo3temp/var/tests/', $directory);
            $this->testFilesToDelete[] = PATH_site . 'typo3temp/var/tests/' . $directory;
            clearstatcache();
            $resultDirectoryGroup = filegroup(PATH_site . 'typo3temp/var/tests/' . $directory);
            $this->assertEquals($resultDirectoryGroup, $swapGroup);
        }
    }

    /**
     * @test
     */
    public function mkdirDeepSetsGroupOwnershipOfCreatedParentDirectory()
    {
        $swapGroup = $this->checkGroups(__FUNCTION__);
        if ($swapGroup !== false) {
            $GLOBALS['TYPO3_CONF_VARS']['SYS']['createGroup'] = $swapGroup;
            $directory = $this->getUniqueId('mkdirdeeptest_');
            $subDirectory = $directory . '/bar';
            GeneralUtility::mkdir_deep(PATH_site . 'typo3temp/var/tests/', $subDirectory);
            $this->testFilesToDelete[] = PATH_site . 'typo3temp/var/tests/' . $directory;
            clearstatcache();
            $resultDirectoryGroup = filegroup(PATH_site . 'typo3temp/var/tests/' . $directory);
            $this->assertEquals($resultDirectoryGroup, $swapGroup);
        }
    }

    /**
     * @test
     */
    public function mkdirDeepSetsGroupOwnershipOnNewSubDirectory()
    {
        $swapGroup = $this->checkGroups(__FUNCTION__);
        if ($swapGroup !== false) {
            $GLOBALS['TYPO3_CONF_VARS']['SYS']['createGroup'] = $swapGroup;
            $directory = $this->getUniqueId('mkdirdeeptest_');
            $subDirectory = $directory . '/bar';
            GeneralUtility::mkdir_deep(PATH_site . 'typo3temp/var/tests/', $subDirectory);
            $this->testFilesToDelete[] = PATH_site . 'typo3temp/var/tests/' . $directory;
            clearstatcache();
            $resultDirectoryGroup = filegroup(PATH_site . 'typo3temp/var/tests/' . $directory);
            $this->assertEquals($resultDirectoryGroup, $swapGroup);
        }
    }

    /**
     * @test
     */
    public function mkdirDeepCreatesDirectoryInVfsStream()
    {
        if (!class_exists('org\\bovigo\\vfs\\vfsStreamWrapper')) {
            $this->markTestSkipped('mkdirDeepCreatesDirectoryInVfsStream() test not available with this phpunit version.');
        }
        vfsStreamWrapper::register();
        $baseDirectory = $this->getUniqueId('test_');
        vfsStreamWrapper::setRoot(new vfsStreamDirectory($baseDirectory));
        GeneralUtility::mkdir_deep('vfs://' . $baseDirectory . '/', 'sub');
        $this->assertTrue(is_dir('vfs://' . $baseDirectory . '/sub'));
    }

    /**
     * @test
     */
    public function mkdirDeepThrowsExceptionIfDirectoryCreationFails()
    {
        $this->expectException(\RuntimeException::class);
        $this->expectExceptionCode(1170251401);

        GeneralUtility::mkdir_deep('http://localhost');
    }

    /**
     * @test
     */
    public function mkdirDeepThrowsExceptionIfBaseDirectoryIsNotOfTypeString()
    {
        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionCode(1303662955);

        GeneralUtility::mkdir_deep([]);
    }

    /**
     * @test
     */
    public function mkdirDeepThrowsExceptionIfDeepDirectoryIsNotOfTypeString()
    {
        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionCode(1303662956);

        GeneralUtility::mkdir_deep(PATH_site . 'typo3temp/foo', []);
    }

    ///////////////////////////////
    // Tests concerning rmdir
    ///////////////////////////////

    /**
     * @test
     */
    public function rmdirRemovesFile()
    {
        $file = PATH_site . 'typo3temp/var/tests/' . $this->getUniqueId('file_');
        touch($file);
        GeneralUtility::rmdir($file);
        $this->assertFalse(file_exists($file));
    }

    /**
     * @test
     */
    public function rmdirReturnTrueIfFileWasRemoved()
    {
        $file = PATH_site . 'typo3temp/var/tests/' . $this->getUniqueId('file_');
        touch($file);
        $this->assertTrue(GeneralUtility::rmdir($file));
    }

    /**
     * @test
     */
    public function rmdirReturnFalseIfNoFileWasRemoved()
    {
        $file = PATH_site . 'typo3temp/var/tests/' . $this->getUniqueId('file_');
        $this->assertFalse(GeneralUtility::rmdir($file));
    }

    /**
     * @test
     */
    public function rmdirRemovesDirectory()
    {
        $directory = PATH_site . 'typo3temp/var/tests/' . $this->getUniqueId('directory_');
        mkdir($directory);
        GeneralUtility::rmdir($directory);
        $this->assertFalse(file_exists($directory));
    }

    /**
     * @test
     */
    public function rmdirRemovesDirectoryWithTrailingSlash()
    {
        $directory = PATH_site . 'typo3temp/var/tests/' . $this->getUniqueId('directory_') . '/';
        mkdir($directory);
        GeneralUtility::rmdir($directory);
        $this->assertFalse(file_exists($directory));
    }

    /**
     * @test
     */
    public function rmdirDoesNotRemoveDirectoryWithFilesAndReturnsFalseIfRecursiveDeletionIsOff()
    {
        $directory = PATH_site . 'typo3temp/var/tests/' . $this->getUniqueId('directory_') . '/';
        mkdir($directory);
        $file = $this->getUniqueId('file_');
        touch($directory . $file);
        $this->testFilesToDelete[] = $directory;
        $return = GeneralUtility::rmdir($directory);
        $this->assertTrue(file_exists($directory));
        $this->assertTrue(file_exists($directory . $file));
        $this->assertFalse($return);
    }

    /**
     * @test
     */
    public function rmdirRemovesDirectoriesRecursiveAndReturnsTrue()
    {
        $directory = PATH_site . 'typo3temp/var/tests/' . $this->getUniqueId('directory_') . '/';
        mkdir($directory);
        mkdir($directory . 'sub/');
        touch($directory . 'sub/file');
        $return = GeneralUtility::rmdir($directory, true);
        $this->assertFalse(file_exists($directory));
        $this->assertTrue($return);
    }

    /**
     * @test
     */
    public function rmdirRemovesLinkToDirectory()
    {
        $existingDirectory = PATH_site . 'typo3temp/var/tests/' . $this->getUniqueId('notExists_') . '/';
        mkdir($existingDirectory);
        $this->testFilesToDelete[] = $existingDirectory;
        $symlinkName = PATH_site . 'typo3temp/var/tests/' . $this->getUniqueId('link_');
        symlink($existingDirectory, $symlinkName);
        GeneralUtility::rmdir($symlinkName, true);
        $this->assertFalse(is_link($symlinkName));
    }

    /**
     * @test
     */
    public function rmdirRemovesDeadLinkToDirectory()
    {
        $notExistingDirectory = PATH_site . 'typo3temp/var/tests/' . $this->getUniqueId('notExists_') . '/';
        $symlinkName = PATH_site . 'typo3temp/var/tests/' . $this->getUniqueId('link_');
        mkdir($notExistingDirectory);
        symlink($notExistingDirectory, $symlinkName);
        rmdir($notExistingDirectory);

        GeneralUtility::rmdir($symlinkName, true);
        $this->assertFalse(is_link($symlinkName));
    }

    /**
     * @test
     */
    public function rmdirRemovesDeadLinkToFile()
    {
        $notExistingFile = PATH_site . 'typo3temp/var/tests/' . $this->getUniqueId('notExists_');
        $symlinkName = PATH_site . 'typo3temp/var/tests/' . $this->getUniqueId('link_');
        touch($notExistingFile);
        symlink($notExistingFile, $symlinkName);
        unlink($notExistingFile);
        GeneralUtility::rmdir($symlinkName, true);
        $this->assertFalse(is_link($symlinkName));
    }

    ///////////////////////////////////
    // Tests concerning getFilesInDir
    ///////////////////////////////////

    /**
     * Helper method to create test directory.
     *
     * @return string A unique directory name prefixed with test_.
     */
    protected function getFilesInDirCreateTestDirectory()
    {
        if (!class_exists('org\\bovigo\\vfs\\vfsStreamWrapper')) {
            $this->markTestSkipped('getFilesInDirCreateTestDirectory() helper method not available without vfsStream.');
        }
        $structure = [
            'subDirectory' => [
                'test.php' => 'butter',
                'other.php' => 'milk',
                'stuff.csv' => 'honey',
            ],
            'excludeMe.txt' => 'cocoa nibs',
            'testB.txt' => 'olive oil',
            'testA.txt' => 'eggs',
            'testC.txt' => 'carrots',
            'test.js' => 'oranges',
            'test.css' => 'apples',
            '.secret.txt' => 'sammon',
        ];
        vfsStream::setup('test', null, $structure);
        $vfsUrl = vfsStream::url('test');

        // set random values for mtime
        foreach ($structure as $structureLevel1Key => $structureLevel1Content) {
            $newMtime = rand();
            if (is_array($structureLevel1Content)) {
                foreach ($structureLevel1Content as $structureLevel2Key => $structureLevel2Content) {
                    touch($vfsUrl . '/' . $structureLevel1Key . '/' . $structureLevel2Key, $newMtime);
                }
            } else {
                touch($vfsUrl . '/' . $structureLevel1Key, $newMtime);
            }
        }

        return $vfsUrl;
    }

    /**
     * @test
     */
    public function getFilesInDirFindsRegularFile()
    {
        $vfsStreamUrl = $this->getFilesInDirCreateTestDirectory();
        $files = GeneralUtility::getFilesInDir($vfsStreamUrl);
        $this->assertContains('testA.txt', $files);
    }

    /**
     * @test
     */
    public function getFilesInDirFindsHiddenFile()
    {
        $vfsStreamUrl = $this->getFilesInDirCreateTestDirectory();
        $files = GeneralUtility::getFilesInDir($vfsStreamUrl);
        $this->assertContains('.secret.txt', $files);
    }

    /**
     * @test
     */
    public function getFilesInDirByExtensionFindsFiles()
    {
        $vfsStreamUrl = $this->getFilesInDirCreateTestDirectory();
        $files = GeneralUtility::getFilesInDir($vfsStreamUrl, 'txt,js');
        $this->assertContains('testA.txt', $files);
        $this->assertContains('test.js', $files);
    }

    /**
     * @test
     */
    public function getFilesInDirByExtensionDoesNotFindFilesWithOtherExtensions()
    {
        $vfsStreamUrl = $this->getFilesInDirCreateTestDirectory();
        $files = GeneralUtility::getFilesInDir($vfsStreamUrl, 'txt,js');
        $this->assertContains('testA.txt', $files);
        $this->assertContains('test.js', $files);
        $this->assertNotContains('test.css', $files);
    }

    /**
     * @test
     */
    public function getFilesInDirExcludesFilesMatchingPattern()
    {
        $vfsStreamUrl = $this->getFilesInDirCreateTestDirectory();
        $files = GeneralUtility::getFilesInDir($vfsStreamUrl, '', false, '', 'excludeMe.*');
        $this->assertContains('test.js', $files);
        $this->assertNotContains('excludeMe.txt', $files);
    }

    /**
     * @test
     */
    public function getFilesInDirCanPrependPath()
    {
        $vfsStreamUrl = $this->getFilesInDirCreateTestDirectory();
        $this->assertContains(
            $vfsStreamUrl . '/testA.txt',
            GeneralUtility::getFilesInDir($vfsStreamUrl, '', true)
        );
    }

    /**
     * @test
     */
    public function getFilesInDirDoesSortAlphabeticallyByDefault()
    {
        $vfsStreamUrl = $this->getFilesInDirCreateTestDirectory();
        $this->assertSame(
            array_values(GeneralUtility::getFilesInDir($vfsStreamUrl, '', false)),
            ['.secret.txt', 'excludeMe.txt', 'test.css', 'test.js', 'testA.txt', 'testB.txt', 'testC.txt']
        );
    }

    /**
     * @test
     */
    public function getFilesInDirCanOrderByMtime()
    {
        $vfsStreamUrl = $this->getFilesInDirCreateTestDirectory();
        $files = [];
        $iterator = new \DirectoryIterator($vfsStreamUrl);
        foreach ($iterator as $fileinfo) {
            if ($fileinfo->isFile()) {
                $files[$fileinfo->getFilename()] = $fileinfo->getMTime();
            }
        }
        asort($files);
        $this->assertSame(
            array_values(GeneralUtility::getFilesInDir($vfsStreamUrl, '', false, 'mtime')),
            array_keys($files)
        );
    }

    /**
     * @test
     */
    public function getFilesInDirReturnsArrayWithMd5OfElementAndPathAsArrayKey()
    {
        $vfsStreamUrl = $this->getFilesInDirCreateTestDirectory();
        $this->assertArrayHasKey(
            md5($vfsStreamUrl . '/testA.txt'),
            GeneralUtility::getFilesInDir($vfsStreamUrl)
        );
    }

    /**
     * @test
     */
    public function getFilesInDirDoesNotFindDirectories()
    {
        $vfsStreamUrl = $this->getFilesInDirCreateTestDirectory();
        $this->assertNotContains(
            'subDirectory',
            GeneralUtility::getFilesInDir($vfsStreamUrl)
        );
    }

    /**
     * Dotfiles; current directory: '.' and parent directory: '..' must not be
     * present.
     *
     * @test
     */
    public function getFilesInDirDoesNotFindDotfiles()
    {
        $vfsStreamUrl = $this->getFilesInDirCreateTestDirectory();
        $files = GeneralUtility::getFilesInDir($vfsStreamUrl);
        $this->assertNotContains('..', $files);
        $this->assertNotContains('.', $files);
    }

    ///////////////////////////////
    // Tests concerning unQuoteFilenames
    ///////////////////////////////
    /**
     * Data provider for ImageMagick shell commands
     *
     * @see explodeAndUnquoteImageMagickCommands
     */
    public function imageMagickCommandsDataProvider()
    {
        return [
            // Some theoretical tests first
            [
                '',
                [],
                []
            ],
            [
                'aa bb "cc" "dd"',
                ['aa', 'bb', '"cc"', '"dd"'],
                ['aa', 'bb', 'cc', 'dd']
            ],
            [
                'aa bb "cc dd"',
                ['aa', 'bb', '"cc dd"'],
                ['aa', 'bb', 'cc dd']
            ],
            [
                '\'aa bb\' "cc dd"',
                ['\'aa bb\'', '"cc dd"'],
                ['aa bb', 'cc dd']
            ],
            [
                '\'aa bb\' cc "dd"',
                ['\'aa bb\'', 'cc', '"dd"'],
                ['aa bb', 'cc', 'dd']
            ],
            // Now test against some real world examples
            [
                '/opt/local/bin/gm.exe convert +profile \'*\' -geometry 170x136!  -negate "C:/Users/Someuser.Domain/Documents/Htdocs/typo3temp/var/transient/61401f5c16c63d58e1d92e8a2449f2fe_maskNT.gif[0]" "C:/Users/Someuser.Domain/Documents/Htdocs/typo3temp/var/transient/61401f5c16c63d58e1d92e8a2449f2fe_maskNT.gif"',
                [
                    '/opt/local/bin/gm.exe',
                    'convert',
                    '+profile',
                    '\'*\'',
                    '-geometry',
                    '170x136!',
                    '-negate',
                    '"C:/Users/Someuser.Domain/Documents/Htdocs/typo3temp/var/transient/61401f5c16c63d58e1d92e8a2449f2fe_maskNT.gif[0]"',
                    '"C:/Users/Someuser.Domain/Documents/Htdocs/typo3temp/var/transient/61401f5c16c63d58e1d92e8a2449f2fe_maskNT.gif"'
                ],
                [
                    '/opt/local/bin/gm.exe',
                    'convert',
                    '+profile',
                    '*',
                    '-geometry',
                    '170x136!',
                    '-negate',
                    'C:/Users/Someuser.Domain/Documents/Htdocs/typo3temp/var/transient/61401f5c16c63d58e1d92e8a2449f2fe_maskNT.gif[0]',
                    'C:/Users/Someuser.Domain/Documents/Htdocs/typo3temp/var/transient/61401f5c16c63d58e1d92e8a2449f2fe_maskNT.gif'
                ]
            ],
            [
                'C:/opt/local/bin/gm.exe convert +profile \'*\' -geometry 170x136!  -negate "C:/Program Files/Apache2/htdocs/typo3temp/var/transient/61401f5c16c63d58e1d92e8a2449f2fe_maskNT.gif[0]" "C:/Program Files/Apache2/htdocs/typo3temp/var/transient/61401f5c16c63d58e1d92e8a2449f2fe_maskNT.gif"',
                [
                    'C:/opt/local/bin/gm.exe',
                    'convert',
                    '+profile',
                    '\'*\'',
                    '-geometry',
                    '170x136!',
                    '-negate',
                    '"C:/Program Files/Apache2/htdocs/typo3temp/var/transient/61401f5c16c63d58e1d92e8a2449f2fe_maskNT.gif[0]"',
                    '"C:/Program Files/Apache2/htdocs/typo3temp/var/transient/61401f5c16c63d58e1d92e8a2449f2fe_maskNT.gif"'
                ],
                [
                    'C:/opt/local/bin/gm.exe',
                    'convert',
                    '+profile',
                    '*',
                    '-geometry',
                    '170x136!',
                    '-negate',
                    'C:/Program Files/Apache2/htdocs/typo3temp/var/transient/61401f5c16c63d58e1d92e8a2449f2fe_maskNT.gif[0]',
                    'C:/Program Files/Apache2/htdocs/typo3temp/var/transient/61401f5c16c63d58e1d92e8a2449f2fe_maskNT.gif'
                ]
            ],
            [
                '/usr/bin/gm convert +profile \'*\' -geometry 170x136!  -negate "/Shared Items/Data/Projects/typo3temp/var/transient/61401f5c16c63d58e1d92e8a2449f2fe_maskNT.gif[0]" "/Shared Items/Data/Projects/typo3temp/var/transient/61401f5c16c63d58e1d92e8a2449f2fe_maskNT.gif"',
                [
                    '/usr/bin/gm',
                    'convert',
                    '+profile',
                    '\'*\'',
                    '-geometry',
                    '170x136!',
                    '-negate',
                    '"/Shared Items/Data/Projects/typo3temp/var/transient/61401f5c16c63d58e1d92e8a2449f2fe_maskNT.gif[0]"',
                    '"/Shared Items/Data/Projects/typo3temp/var/transient/61401f5c16c63d58e1d92e8a2449f2fe_maskNT.gif"'
                ],
                [
                    '/usr/bin/gm',
                    'convert',
                    '+profile',
                    '*',
                    '-geometry',
                    '170x136!',
                    '-negate',
                    '/Shared Items/Data/Projects/typo3temp/var/transient/61401f5c16c63d58e1d92e8a2449f2fe_maskNT.gif[0]',
                    '/Shared Items/Data/Projects/typo3temp/var/transient/61401f5c16c63d58e1d92e8a2449f2fe_maskNT.gif'
                ]
            ],
            [
                '/usr/bin/gm convert +profile \'*\' -geometry 170x136!  -negate "/Network/Servers/server01.internal/Projects/typo3temp/var/transient/61401f5c16c63d58e1d92e8a2449f2fe_maskNT.gif[0]" "/Network/Servers/server01.internal/Projects/typo3temp/var/transient/61401f5c16c63d58e1d92e8a2449f2fe_maskNT.gif"',
                [
                    '/usr/bin/gm',
                    'convert',
                    '+profile',
                    '\'*\'',
                    '-geometry',
                    '170x136!',
                    '-negate',
                    '"/Network/Servers/server01.internal/Projects/typo3temp/var/transient/61401f5c16c63d58e1d92e8a2449f2fe_maskNT.gif[0]"',
                    '"/Network/Servers/server01.internal/Projects/typo3temp/var/transient/61401f5c16c63d58e1d92e8a2449f2fe_maskNT.gif"'
                ],
                [
                    '/usr/bin/gm',
                    'convert',
                    '+profile',
                    '*',
                    '-geometry',
                    '170x136!',
                    '-negate',
                    '/Network/Servers/server01.internal/Projects/typo3temp/var/transient/61401f5c16c63d58e1d92e8a2449f2fe_maskNT.gif[0]',
                    '/Network/Servers/server01.internal/Projects/typo3temp/var/transient/61401f5c16c63d58e1d92e8a2449f2fe_maskNT.gif'
                ]
            ],
            [
                '/usr/bin/gm convert +profile \'*\' -geometry 170x136!  -negate \'/Network/Servers/server01.internal/Projects/typo3temp/var/transient/61401f5c16c63d58e1d92e8a2449f2fe_maskNT.gif[0]\' \'/Network/Servers/server01.internal/Projects/typo3temp/var/transient/61401f5c16c63d58e1d92e8a2449f2fe_maskNT.gif\'',
                [
                    '/usr/bin/gm',
                    'convert',
                    '+profile',
                    '\'*\'',
                    '-geometry',
                    '170x136!',
                    '-negate',
                    '\'/Network/Servers/server01.internal/Projects/typo3temp/var/transient/61401f5c16c63d58e1d92e8a2449f2fe_maskNT.gif[0]\'',
                    '\'/Network/Servers/server01.internal/Projects/typo3temp/var/transient/61401f5c16c63d58e1d92e8a2449f2fe_maskNT.gif\''
                ],
                [
                    '/usr/bin/gm',
                    'convert',
                    '+profile',
                    '*',
                    '-geometry',
                    '170x136!',
                    '-negate',
                    '/Network/Servers/server01.internal/Projects/typo3temp/var/transient/61401f5c16c63d58e1d92e8a2449f2fe_maskNT.gif[0]',
                    '/Network/Servers/server01.internal/Projects/typo3temp/var/transient/61401f5c16c63d58e1d92e8a2449f2fe_maskNT.gif'
                ]
            ]
        ];
    }

    /**
     * Tests if the commands are exploded and unquoted correctly
     *
     * @dataProvider imageMagickCommandsDataProvider
     * @test
     */
    public function explodeAndUnquoteImageMagickCommands($source, $expectedQuoted, $expectedUnquoted)
    {
        $actualQuoted = GeneralUtility::unQuoteFilenames($source);
        $actualUnquoted = GeneralUtility::unQuoteFilenames($source, true);
        $this->assertEquals($expectedQuoted, $actualQuoted, 'The exploded command does not match the expected');
        $this->assertEquals($expectedUnquoted, $actualUnquoted, 'The exploded and unquoted command does not match the expected');
    }

    ///////////////////////////////
    // Tests concerning split_fileref
    ///////////////////////////////
    /**
     * @test
     */
    public function splitFileRefReturnsFileTypeNotForFolders()
    {
        $directoryName = $this->getUniqueId('test_') . '.com';
        $directoryPath = PATH_site . 'typo3temp/var/tests/';
        $directory = $directoryPath . $directoryName;
        mkdir($directory, octdec($GLOBALS['TYPO3_CONF_VARS']['SYS']['folderCreateMask']));
        $fileInfo = GeneralUtility::split_fileref($directory);
        $directoryCreated = is_dir($directory);
        rmdir($directory);
        $this->assertTrue($directoryCreated);
        $this->assertInternalType(\PHPUnit_Framework_Constraint_IsType::TYPE_ARRAY, $fileInfo);
        $this->assertEquals($directoryPath, $fileInfo['path']);
        $this->assertEquals($directoryName, $fileInfo['file']);
        $this->assertEquals($directoryName, $fileInfo['filebody']);
        $this->assertEquals('', $fileInfo['fileext']);
        $this->assertArrayNotHasKey('realFileext', $fileInfo);
    }

    /**
     * @test
     */
    public function splitFileRefReturnsFileTypeForFilesWithoutPathSite()
    {
        $testFile = 'fileadmin/media/someFile.png';
        $fileInfo = GeneralUtility::split_fileref($testFile);
        $this->assertInternalType(\PHPUnit_Framework_Constraint_IsType::TYPE_ARRAY, $fileInfo);
        $this->assertEquals('fileadmin/media/', $fileInfo['path']);
        $this->assertEquals('someFile.png', $fileInfo['file']);
        $this->assertEquals('someFile', $fileInfo['filebody']);
        $this->assertEquals('png', $fileInfo['fileext']);
    }

    /////////////////////////////
    // Tests concerning dirname
    /////////////////////////////
    /**
     * @see dirnameWithDataProvider
     * @return array<array>
     */
    public function dirnameDataProvider()
    {
        return [
            'absolute path with multiple part and file' => ['/dir1/dir2/script.php', '/dir1/dir2'],
            'absolute path with one part' => ['/dir1/', '/dir1'],
            'absolute path to file without extension' => ['/dir1/something', '/dir1'],
            'relative path with one part and file' => ['dir1/script.php', 'dir1'],
            'relative one-character path with one part and file' => ['d/script.php', 'd'],
            'absolute zero-part path with file' => ['/script.php', ''],
            'empty string' => ['', '']
        ];
    }

    /**
     * @test
     * @dataProvider dirnameDataProvider
     * @param string $input the input for dirname
     * @param string $expectedValue the expected return value expected from dirname
     */
    public function dirnameWithDataProvider($input, $expectedValue)
    {
        $this->assertEquals($expectedValue, GeneralUtility::dirname($input));
    }

    /////////////////////////////////////
    // Tests concerning resolveBackPath
    /////////////////////////////////////
    /**
     * @see resolveBackPathWithDataProvider
     * @return array<array>
     */
    public function resolveBackPathDataProvider()
    {
        return [
            'empty path' => ['', ''],
            'this directory' => ['./', './'],
            'relative directory without ..' => ['dir1/dir2/dir3/', 'dir1/dir2/dir3/'],
            'relative path without ..' => ['dir1/dir2/script.php', 'dir1/dir2/script.php'],
            'absolute directory without ..' => ['/dir1/dir2/dir3/', '/dir1/dir2/dir3/'],
            'absolute path without ..' => ['/dir1/dir2/script.php', '/dir1/dir2/script.php'],
            'only one directory upwards without trailing slash' => ['..', '..'],
            'only one directory upwards with trailing slash' => ['../', '../'],
            'one level with trailing ..' => ['dir1/..', ''],
            'one level with trailing ../' => ['dir1/../', ''],
            'two levels with trailing ..' => ['dir1/dir2/..', 'dir1'],
            'two levels with trailing ../' => ['dir1/dir2/../', 'dir1/'],
            'leading ../ without trailing /' => ['../dir1', '../dir1'],
            'leading ../ with trailing /' => ['../dir1/', '../dir1/'],
            'leading ../ and inside path' => ['../dir1/dir2/../dir3/', '../dir1/dir3/'],
            'one times ../ in relative directory' => ['dir1/../dir2/', 'dir2/'],
            'one times ../ in absolute directory' => ['/dir1/../dir2/', '/dir2/'],
            'one times ../ in relative path' => ['dir1/../dir2/script.php', 'dir2/script.php'],
            'one times ../ in absolute path' => ['/dir1/../dir2/script.php', '/dir2/script.php'],
            'consecutive ../' => ['dir1/dir2/dir3/../../../dir4', 'dir4'],
            'distrubuted ../ with trailing /' => ['dir1/../dir2/dir3/../', 'dir2/'],
            'distributed ../ without trailing /' => ['dir1/../dir2/dir3/..', 'dir2'],
            'multiple distributed and consecutive ../ together' => ['dir1/dir2/dir3/dir4/../../dir5/dir6/dir7/../dir8/', 'dir1/dir2/dir5/dir6/dir8/'],
            'dirname with leading ..' => ['dir1/..dir2/dir3/', 'dir1/..dir2/dir3/'],
            'dirname with trailing ..' => ['dir1/dir2../dir3/', 'dir1/dir2../dir3/'],
            'more times upwards than downwards in directory' => ['dir1/../../', '../'],
            'more times upwards than downwards in path' => ['dir1/../../script.php', '../script.php']
        ];
    }

    /**
     * @test
     * @dataProvider resolveBackPathDataProvider
     * @param string $input the input for resolveBackPath
     * @param $expectedValue Expected return value from resolveBackPath
     */
    public function resolveBackPathWithDataProvider($input, $expectedValue)
    {
        $this->assertEquals($expectedValue, GeneralUtility::resolveBackPath($input));
    }

    /////////////////////////////////////////////////////////////////////////////////////
    // Tests concerning makeInstance, setSingletonInstance, addInstance, purgeInstances
    /////////////////////////////////////////////////////////////////////////////////////
    /**
     * @test
     */
    public function makeInstanceWithEmptyClassNameThrowsException()
    {
        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionCode(1288965219);

        GeneralUtility::makeInstance('');
    }

    /**
     * @test
     */
    public function makeInstanceWithNullClassNameThrowsException()
    {
        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionCode(1288965219);

        GeneralUtility::makeInstance(null);
    }

    /**
     * @test
     */
    public function makeInstanceWithZeroStringClassNameThrowsException()
    {
        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionCode(1288965219);

        GeneralUtility::makeInstance(0);
    }

    /**
     * @test
     */
    public function makeInstanceWithEmptyArrayThrowsException()
    {
        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionCode(1288965219);

        GeneralUtility::makeInstance([]);
    }

    /**
     * @test
     */
    public function makeInstanceWithNonEmptyArrayThrowsException()
    {
        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionCode(1288965219);

        GeneralUtility::makeInstance(['foo']);
    }

    /**
     * @test
     */
    public function makeInstanceWithBeginningSlashInClassNameThrowsException()
    {
        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionCode(1420281366);

        GeneralUtility::makeInstance('\\TYPO3\\CMS\\Backend\\Controller\\BackendController');
    }

    /**
     * @test
     */
    public function makeInstanceReturnsClassInstance()
    {
        $className = get_class($this->getMockBuilder('foo')->getMock());
        $this->assertTrue(GeneralUtility::makeInstance($className) instanceof $className);
    }

    /**
     * @test
     */
    public function makeInstancePassesParametersToConstructor()
    {
        $instance = GeneralUtility::makeInstance(TwoParametersConstructorFixture::class, 'one parameter', 'another parameter');
        $this->assertEquals('one parameter', $instance->constructorParameter1, 'The first constructor parameter has not been set.');
        $this->assertEquals('another parameter', $instance->constructorParameter2, 'The second constructor parameter has not been set.');
    }

    /**
     * @test
     */
    public function makeInstanceInstanciatesConfiguredImplementation()
    {
        GeneralUtilityFixture::resetFinalClassNameCache();
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['Objects'][OriginalClassFixture::class] = ['className' => ReplacementClassFixture::class];
        $this->assertInstanceOf(ReplacementClassFixture::class, GeneralUtility::makeInstance(OriginalClassFixture::class));
    }

    /**
     * @test
     */
    public function makeInstanceResolvesConfiguredImplementationsRecursively()
    {
        GeneralUtilityFixture::resetFinalClassNameCache();
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['Objects'][OriginalClassFixture::class] = ['className' => ReplacementClassFixture::class];
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['Objects'][ReplacementClassFixture::class] = ['className' => OtherReplacementClassFixture::class];
        $this->assertInstanceOf(OtherReplacementClassFixture::class, GeneralUtility::makeInstance(OriginalClassFixture::class));
    }

    /**
     * @test
     */
    public function makeInstanceCalledTwoTimesForNonSingletonClassReturnsDifferentInstances()
    {
        $className = get_class($this->getMockBuilder('foo')->getMock());
        $this->assertNotSame(GeneralUtility::makeInstance($className), GeneralUtility::makeInstance($className));
    }

    /**
     * @test
     */
    public function makeInstanceCalledTwoTimesForSingletonClassReturnsSameInstance()
    {
        $className = get_class($this->createMock(\TYPO3\CMS\Core\SingletonInterface::class));
        $this->assertSame(GeneralUtility::makeInstance($className), GeneralUtility::makeInstance($className));
    }

    /**
     * @test
     */
    public function makeInstanceCalledTwoTimesForSingletonClassWithPurgeInstancesInbetweenReturnsDifferentInstances()
    {
        $className = get_class($this->createMock(\TYPO3\CMS\Core\SingletonInterface::class));
        $instance = GeneralUtility::makeInstance($className);
        GeneralUtility::purgeInstances();
        $this->assertNotSame($instance, GeneralUtility::makeInstance($className));
    }

    /**
     * @test
     */
    public function setSingletonInstanceForEmptyClassNameThrowsException()
    {
        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionCode(1288967479);

        $instance = $this->createMock(\TYPO3\CMS\Core\SingletonInterface::class);
        GeneralUtility::setSingletonInstance('', $instance);
    }

    /**
     * @test
     */
    public function setSingletonInstanceForClassThatIsNoSubclassOfProvidedClassThrowsException()
    {
        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionCode(1288967686);

        $instance = $this->getMockBuilder(\TYPO3\CMS\Core\SingletonInterface::class)
            ->setMethods(['foo'])
            ->getMock();
        $singletonClassName = get_class($this->createMock(\TYPO3\CMS\Core\SingletonInterface::class));
        GeneralUtility::setSingletonInstance($singletonClassName, $instance);
    }

    /**
     * @test
     */
    public function setSingletonInstanceMakesMakeInstanceReturnThatInstance()
    {
        $instance = $this->createMock(\TYPO3\CMS\Core\SingletonInterface::class);
        $singletonClassName = get_class($instance);
        GeneralUtility::setSingletonInstance($singletonClassName, $instance);
        $this->assertSame($instance, GeneralUtility::makeInstance($singletonClassName));
    }

    /**
     * @test
     */
    public function setSingletonInstanceCalledTwoTimesMakesMakeInstanceReturnLastSetInstance()
    {
        $instance1 = $this->createMock(\TYPO3\CMS\Core\SingletonInterface::class);
        $singletonClassName = get_class($instance1);
        $instance2 = new $singletonClassName();
        GeneralUtility::setSingletonInstance($singletonClassName, $instance1);
        GeneralUtility::setSingletonInstance($singletonClassName, $instance2);
        $this->assertSame($instance2, GeneralUtility::makeInstance($singletonClassName));
    }

    /**
     * @test
     */
    public function getSingletonInstancesContainsPreviouslySetSingletonInstance()
    {
        $instance = $this->createMock(\TYPO3\CMS\Core\SingletonInterface::class);
        $instanceClassName = get_class($instance);
        GeneralUtility::setSingletonInstance($instanceClassName, $instance);
        $registeredSingletonInstances = GeneralUtility::getSingletonInstances();
        $this->assertArrayHasKey($instanceClassName, $registeredSingletonInstances);
        $this->assertSame($registeredSingletonInstances[$instanceClassName], $instance);
    }

    /**
     * @test
     */
    public function resetSingletonInstancesResetsPreviouslySetInstance()
    {
        $instance = $this->createMock(\TYPO3\CMS\Core\SingletonInterface::class);
        $instanceClassName = get_class($instance);
        GeneralUtility::setSingletonInstance($instanceClassName, $instance);
        GeneralUtility::resetSingletonInstances([]);
        $registeredSingletonInstances = GeneralUtility::getSingletonInstances();
        $this->assertArrayNotHasKey($instanceClassName, $registeredSingletonInstances);
    }

    /**
     * @test
     */
    public function resetSingletonInstancesSetsGivenInstance()
    {
        $instance = $this->createMock(\TYPO3\CMS\Core\SingletonInterface::class);
        $instanceClassName = get_class($instance);
        GeneralUtility::resetSingletonInstances(
            [$instanceClassName => $instance]
        );
        $registeredSingletonInstances = GeneralUtility::getSingletonInstances();
        $this->assertArrayHasKey($instanceClassName, $registeredSingletonInstances);
        $this->assertSame($registeredSingletonInstances[$instanceClassName], $instance);
    }

    /**
     * @test
     */
    public function addInstanceForEmptyClassNameThrowsException()
    {
        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionCode(1288967479);

        $instance = $this->getMockBuilder('foo')->getMock();
        GeneralUtility::addInstance('', $instance);
    }

    /**
     * @test
     */
    public function addInstanceForClassThatIsNoSubclassOfProvidedClassThrowsException()
    {
        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionCode(1288967686);

        $instance = $this->getMockBuilder('foo')
            ->setMethods(['bar'])
            ->getMock();
        $singletonClassName = get_class($this->createMock('foo'));
        GeneralUtility::addInstance($singletonClassName, $instance);
    }

    /**
     * @test
     */
    public function addInstanceWithSingletonInstanceThrowsException()
    {
        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionCode(1288969325);

        $instance = $this->createMock(\TYPO3\CMS\Core\SingletonInterface::class);
        GeneralUtility::addInstance(get_class($instance), $instance);
    }

    /**
     * @test
     */
    public function addInstanceMakesMakeInstanceReturnThatInstance()
    {
        $instance = $this->createMock('foo');
        $className = get_class($instance);
        GeneralUtility::addInstance($className, $instance);
        $this->assertSame($instance, GeneralUtility::makeInstance($className));
    }

    /**
     * @test
     */
    public function makeInstanceCalledTwoTimesAfterAddInstanceReturnTwoDifferentInstances()
    {
        $instance = $this->createMock('foo');
        $className = get_class($instance);
        GeneralUtility::addInstance($className, $instance);
        $this->assertNotSame(GeneralUtility::makeInstance($className), GeneralUtility::makeInstance($className));
    }

    /**
     * @test
     */
    public function addInstanceCalledTwoTimesMakesMakeInstanceReturnBothInstancesInAddingOrder()
    {
        $instance1 = $this->createMock('foo');
        $className = get_class($instance1);
        GeneralUtility::addInstance($className, $instance1);
        $instance2 = new $className();
        GeneralUtility::addInstance($className, $instance2);
        $this->assertSame($instance1, GeneralUtility::makeInstance($className), 'The first returned instance does not match the first added instance.');
        $this->assertSame($instance2, GeneralUtility::makeInstance($className), 'The second returned instance does not match the second added instance.');
    }

    /**
     * @test
     */
    public function purgeInstancesDropsAddedInstance()
    {
        $instance = $this->createMock('foo');
        $className = get_class($instance);
        GeneralUtility::addInstance($className, $instance);
        GeneralUtility::purgeInstances();
        $this->assertNotSame($instance, GeneralUtility::makeInstance($className));
    }

    /**
     * @return array
     */
    public function getFileAbsFileNameDateprovider()
    {
        return [
            'typo3/sysext/core/Resources/Public/Icons/Extension.png' => ['typo3/sysext/core/Resources/Public/Icons/Extension.png', PATH_site . 'typo3/sysext/core/Resources/Public/Icons/Extension.png'],
            'sysext/core/Resources/Public/Icons/Extension.png' => ['sysext/core/Resources/Public/Icons/Extension.png', PATH_site . 'sysext/core/Resources/Public/Icons/Extension.png'],
            './typo3/sysext/core/Resources/Public/Icons/Extension.png' => ['./typo3/sysext/core/Resources/Public/Icons/Extension.png', PATH_site . './typo3/sysext/core/Resources/Public/Icons/Extension.png'],
            'fileadmin/foo.txt' => ['fileadmin/foo.txt', PATH_site . 'fileadmin/foo.txt'],
            './fileadmin/foo.txt' => ['./fileadmin/foo.txt', PATH_site . './fileadmin/foo.txt'],
            '../sysext/core/Resources/Public/Icons/Extension.png' => ['../sysext/core/Resources/Public/Icons/Extension.png', ''],
            '../fileadmin/foo.txt' => ['../fileadmin/foo.txt', ''],
            'PATH_site . ../sysext/core/Resources/Public/Icons/Extension.png' => [PATH_site . '../sysext/core/Resources/Public/Icons/Extension.png', ''],
            'PATH_site . fileadmin/foo.txt' => [PATH_site . 'fileadmin/foo.txt', PATH_site . 'fileadmin/foo.txt'],
            'PATH_site . typo3/sysext/core/Resources/Public/Icons/Extension.png' => [PATH_site . 'typo3/sysext/core/Resources/Public/Icons/Extension.png', PATH_site . 'typo3/sysext/core/Resources/Public/Icons/Extension.png'],
            'EXT:foo/Resources/Public/Icons/Extension.png' => ['EXT:foo/Resources/Public/Icons/Extension.png', PATH_site . 'typo3/sysext/foo/Resources/Public/Icons/Extension.png']
        ];
    }

    /**
     * @param string $path
     * @param string $expected
     * @test
     * @dataProvider getFileAbsFileNameDateprovider
     */
    public function getFileAbsFileNameReturnsCorrectValues($path, $expected)
    {

        // build the dummy package "foo" for use in ExtensionManagementUtility::extPath('foo');
        $package = $this->getMockBuilder(Package::class)
            ->disableOriginalConstructor()
            ->setMethods(['getPackagePath'])
            ->getMock();
        /** @var PackageManager|\PHPUnit_Framework_MockObject_MockObject $packageManager */
        $packageManager = $this->getMockBuilder(PackageManager::class)
            ->setMethods(['isPackageActive', 'getPackage'])
            ->getMock();
        $package->expects($this->any())
            ->method('getPackagePath')
            ->will($this->returnValue(PATH_site . 'typo3/sysext/foo/'));
        $packageManager->expects($this->any())
            ->method('isPackageActive')
            ->with($this->equalTo('foo'))
            ->will($this->returnValue(true));
        $packageManager->expects($this->any())
            ->method('getPackage')
            ->with('foo')
            ->will($this->returnValue($package));
        ExtensionManagementUtility::setPackageManager($packageManager);

        $result = GeneralUtility::getFileAbsFileName($path);
        $this->assertEquals($expected, $result);
    }

    /**
     * Data provider for validPathStrDetectsInvalidCharacters.
     *
     * @return array
     */
    public function validPathStrInvalidCharactersDataProvider()
    {
        $data = [
            'double slash in path' => ['path//path'],
            'backslash in path' => ['path\\path'],
            'directory up in path' => ['path/../path'],
            'directory up at the beginning' => ['../path'],
            'NUL character in path' => ['path' . chr(0) . 'path'],
            'BS character in path' => ['path' . chr(8) . 'path'],
            'invalid UTF-8-sequence' => ["\xc0" . 'path/path'],
            'Could be overlong NUL in some UTF-8 implementations, invalid in RFC3629' => ["\xc0\x80" . 'path/path'],
        ];

        // Mixing with regular utf-8
        $utf8Characters = 'Ссылка/';
        foreach ($data as $key => $value) {
            $data[$key . ' with UTF-8 characters prepended'] = [$utf8Characters . $value[0]];
            $data[$key . ' with UTF-8 characters appended'] = [$value[0] . $utf8Characters];
        }

        // Encoding with UTF-16
        foreach ($data as $key => $value) {
            $data[$key . ' encoded with UTF-16'] = [mb_convert_encoding($value[0], 'UTF-16')];
        }

        return $data;
    }

    /**
     * Tests whether invalid characters are detected.
     *
     * @param string $path
     * @dataProvider validPathStrInvalidCharactersDataProvider
     * @test
     */
    public function validPathStrDetectsInvalidCharacters($path)
    {
        $this->assertFalse(GeneralUtility::validPathStr($path));
    }

    /**
     * Data provider for positive values within validPathStr()
     */
    public function validPathStrDataProvider()
    {
        $data = [
            'normal ascii path' => ['fileadmin/templates/myfile..xml'],
            'special character' => ['fileadmin/templates/Ссылка (fce).xml']
        ];

        return $data;
    }

    /**
     * Tests whether Unicode characters are recognized as valid file name characters.
     *
     * @dataProvider validPathStrDataProvider
     * @test
     */
    public function validPathStrWorksWithUnicodeFileNames($path)
    {
        $this->assertTrue(GeneralUtility::validPathStr($path));
    }

    /**
     * @return array
     */
    public function deniedFilesDataProvider()
    {
        return [
            'Nul character in file' => ['image' . chr(0) . '.gif'],
            'Nul character in file with .php' => ['image.php' . chr(0) . '.gif'],
            'Regular .php file' => ['file.php'],
            'Regular .php5 file' => ['file.php5'],
            'Regular .php3 file' => ['file.php3'],
            'Regular .phpsh file' => ['file.phpsh'],
            'Regular .phtml file' => ['file.phtml'],
            'PHP file in the middle' => ['file.php.txt'],
            '.htaccess file' => ['.htaccess'],
        ];
    }

    /**
     * Tests whether verifyFilenameAgainstDenyPattern detects denied files.
     *
     * @param string $deniedFile
     * @test
     * @dataProvider deniedFilesDataProvider
     */
    public function verifyFilenameAgainstDenyPatternDetectsNotAllowedFiles($deniedFile)
    {
        $this->assertFalse(GeneralUtility::verifyFilenameAgainstDenyPattern($deniedFile));
    }

    /////////////////////////////////////////////////////////////////////////////////////
    // Tests concerning copyDirectory
    /////////////////////////////////////////////////////////////////////////////////////

    /**
     * @test
     */
    public function copyDirectoryCopiesFilesAndDirectoriesWithRelativePaths()
    {
        $sourceDirectory = 'typo3temp/var/tests/' . $this->getUniqueId('test_') . '/';
        $absoluteSourceDirectory = PATH_site . $sourceDirectory;
        $this->testFilesToDelete[] = $absoluteSourceDirectory;
        GeneralUtility::mkdir($absoluteSourceDirectory);

        $targetDirectory = 'typo3temp/var/tests/' . $this->getUniqueId('test_') . '/';
        $absoluteTargetDirectory = PATH_site . $targetDirectory;
        $this->testFilesToDelete[] = $absoluteTargetDirectory;
        GeneralUtility::mkdir($absoluteTargetDirectory);

        GeneralUtility::writeFileToTypo3tempDir($absoluteSourceDirectory . 'file', '42');
        GeneralUtility::mkdir($absoluteSourceDirectory . 'foo');
        GeneralUtility::writeFileToTypo3tempDir($absoluteSourceDirectory . 'foo/file', '42');

        GeneralUtility::copyDirectory($sourceDirectory, $targetDirectory);

        $this->assertFileExists($absoluteTargetDirectory . 'file');
        $this->assertFileExists($absoluteTargetDirectory . 'foo/file');
    }

    /**
     * @test
     */
    public function copyDirectoryCopiesFilesAndDirectoriesWithAbsolutePaths()
    {
        $sourceDirectory = 'typo3temp/var/tests/' . $this->getUniqueId('test_') . '/';
        $absoluteSourceDirectory = PATH_site . $sourceDirectory;
        $this->testFilesToDelete[] = $absoluteSourceDirectory;
        GeneralUtility::mkdir($absoluteSourceDirectory);

        $targetDirectory = 'typo3temp/var/tests/' . $this->getUniqueId('test_') . '/';
        $absoluteTargetDirectory = PATH_site . $targetDirectory;
        $this->testFilesToDelete[] = $absoluteTargetDirectory;
        GeneralUtility::mkdir($absoluteTargetDirectory);

        GeneralUtility::writeFileToTypo3tempDir($absoluteSourceDirectory . 'file', '42');
        GeneralUtility::mkdir($absoluteSourceDirectory . 'foo');
        GeneralUtility::writeFileToTypo3tempDir($absoluteSourceDirectory . 'foo/file', '42');

        GeneralUtility::copyDirectory($absoluteSourceDirectory, $absoluteTargetDirectory);

        $this->assertFileExists($absoluteTargetDirectory . 'file');
        $this->assertFileExists($absoluteTargetDirectory . 'foo/file');
    }

    /////////////////////////////////////////////////////////////////////////////////////
    // Tests concerning sysLog
    /////////////////////////////////////////////////////////////////////////////////////
    /**
     * @test
     */
    public function syslogFixesPermissionsOnFileIfUsingFileLogging()
    {
        if (TYPO3_OS === 'WIN') {
            $this->markTestSkipped(self::NO_FIX_PERMISSIONS_ON_WINDOWS);
        }
        // Fake all required settings
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['systemLogLevel'] = 0;
        $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_div.php']['systemLogInit'] = true;
        unset($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_div.php']['systemLog']);
        $testLogFilename = PATH_site . 'typo3temp/var/tests/' . $this->getUniqueId('test_') . '.txt';
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['systemLog'] = 'file,' . $testLogFilename . ',0';
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['fileCreateMask'] = '0777';
        // Call method, get actual permissions and clean up
        GeneralUtility::sysLog('testLog', 'test', GeneralUtility::SYSLOG_SEVERITY_NOTICE);
        $this->testFilesToDelete[] = $testLogFilename;
        clearstatcache();
        $this->assertEquals('0777', substr(decoct(fileperms($testLogFilename)), 2));
    }

    /**
     * @test
     */
    public function deprecationLogFixesPermissionsOnLogFile()
    {
        if (TYPO3_OS === 'WIN') {
            $this->markTestSkipped(self::NO_FIX_PERMISSIONS_ON_WINDOWS);
        }
        $filePath = PATH_site . GeneralUtilityFixture::DEPRECATION_LOG_PATH;
        @mkdir(dirname($filePath));
        $this->testFilesToDelete[] = $filePath;
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['enableDeprecationLog'] = true;
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['fileCreateMask'] = '0777';
        GeneralUtilityFixture::deprecationLog('foo');
        clearstatcache();
        $resultFilePermissions = substr(decoct(fileperms($filePath)), 2);
        $this->assertEquals('0777', $resultFilePermissions);
    }

    ///////////////////////////////////////////////////
    // Tests concerning callUserFunction
    ///////////////////////////////////////////////////

    /**
     * @test
     * @dataProvider callUserFunctionInvalidParameterDataprovider
     */
    public function callUserFunctionWillReturnFalseForInvalidParameters($functionName)
    {
        $inputData = ['foo' => 'bar'];
        // omit the debug() output
        ob_start();
        $result = GeneralUtility::callUserFunction($functionName, $inputData, $this, 'user_', 1);
        ob_end_clean();
        $this->assertFalse($result);
    }

    /**
     * @test
     * @dataProvider callUserFunctionInvalidParameterDataprovider
     * @param string $functionName
     * @param int $expectedException
     */
    public function callUserFunctionWillThrowExceptionForInvalidParameters($functionName, $expectedException)
    {
        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionCode($expectedException);

        $inputData = ['foo' => 'bar'];
        GeneralUtility::callUserFunction($functionName, $inputData, $this, 'user_', 2);
    }

    /**
     * Data provider for callUserFunctionInvalidParameterDataprovider and
     * callUserFunctionWillThrowExceptionForInvalidParameters.
     *
     * @return array
     */
    public function callUserFunctionInvalidParameterDataprovider()
    {
        return [
            'Function is not prefixed' => ['t3lib_divTest->calledUserFunction', 1294585866],
            'Class doesn\'t exists' => ['t3lib_divTest21345->user_calledUserFunction', 1294585866],
            'No method name' => ['t3lib_divTest', 1294585867],
            'No class name' => ['->user_calledUserFunction', 1294585866],
            'No function name' => ['', 1294585867]
        ];
    }

    /**
     * Above tests already showed that the prefix is checked properly,
     * therefore this test skips the prefix and enables to inline the instantly
     * created function (who's name doesn't have a prefix).
     *
     * @test
     */
    public function callUserFunctionCanCallFunction()
    {
        $inputData = ['foo' => 'bar'];
        $result = GeneralUtility::callUserFunction(function () {
            return 'Worked fine';
        }, $inputData, $this, '');
        $this->assertEquals('Worked fine', $result);
    }

    /**
     * @test
     */
    public function callUserFunctionCanCallMethod()
    {
        $inputData = ['foo' => 'bar'];
        $result = GeneralUtility::callUserFunction(self::class . '->user_calledUserFunction', $inputData, $this);
        $this->assertEquals('Worked fine', $result);
    }

    /**
     * @return string
     */
    public function user_calledUserFunction()
    {
        return 'Worked fine';
    }

    /**
     * @test
     */
    public function callUserFunctionCanPrefixFuncNameWithFilePath()
    {
        $inputData = ['foo' => 'bar'];
        $result = GeneralUtility::callUserFunction('typo3/sysext/core/Tests/Unit/Utility/GeneralUtilityTest.php:TYPO3\\CMS\\Core\\Tests\\Unit\\Utility\GeneralUtilityTest->user_calledUserFunction', $inputData, $this);
        $this->assertEquals('Worked fine', $result);
    }

    /**
     * @test
     */
    public function callUserFunctionCanPersistObjectsBetweenCalls()
    {
        $inputData = ['called' => []];
        GeneralUtility::callUserFunction('&TYPO3\\CMS\\Core\\Tests\\Unit\\Utility\\GeneralUtilityTest->user_calledUserFunctionCountCallers', $inputData, $this);
        GeneralUtility::callUserFunction('&TYPO3\\CMS\\Core\\Tests\\Unit\\Utility\\GeneralUtilityTest->user_calledUserFunctionCountCallers', $inputData, $this);
        $this->assertEquals(1, count($inputData['called']));
    }

    /**
     * Takes the object hash and adds it to the passed array. In case
     * persisting the objects would not work we'd see two different
     * parent objects.
     *
     * @param $params
     */
    public function user_calledUserFunctionCountCallers(&$params)
    {
        $params['called'][spl_object_hash($this)]++;
    }

    /**
     * @test
     */
    public function callUserFunctionAcceptsClosures()
    {
        $inputData = ['foo' => 'bar'];
        $closure = function ($parameters, $reference) use ($inputData) {
            $reference->assertEquals($inputData, $parameters, 'Passed data doesn\'t match expected output');
            return 'Worked fine';
        };
        $this->assertEquals('Worked fine', GeneralUtility::callUserFunction($closure, $inputData, $this));
    }

    /**
     * @test
     */
    public function callUserFunctionTrimsSpaces()
    {
        $inputData = ['foo' => 'bar'];
        $result = GeneralUtility::callUserFunction("\t" . self::class . '->user_calledUserFunction ', $inputData, $this);
        $this->assertEquals('Worked fine', $result);
    }

    /**
     * @test
     */
    public function getAllFilesAndFoldersInPathReturnsArrayWithMd5Keys()
    {
        $directory = PATH_site . 'typo3temp/var/tests/' . $this->getUniqueId('directory_');
        mkdir($directory);
        $filesAndDirectories = GeneralUtility::getAllFilesAndFoldersInPath([], $directory, '', true);
        $check = true;
        foreach ($filesAndDirectories as $md5 => $path) {
            if (!preg_match('/^[a-f0-9]{32}$/', $md5)) {
                $check = false;
            }
        }
        GeneralUtility::rmdir($directory);
        $this->assertTrue($check);
    }

    /**
     * If the element is not empty, its contents might be treated as "something" (instead of "nothing") e.g. by Fluid
     * view helpers, which is why we want to avoid that.
     *
     * @test
     */
    public function xml2ArrayConvertsEmptyArraysToElementWithoutContent()
    {
        $input = [
            'el' => []
        ];

        $output = GeneralUtility::array2xml($input);

        $this->assertEquals('<phparray>
	<el type="array"></el>
</phparray>', $output);
    }

    /**
     * @return array
     */
    public function providerForXml2Array(): array
    {
        return [
            'inputWithoutWhitespaces' => [
                '<?xml version="1.0" encoding="utf-8" standalone="yes" ?>
                <T3FlexForms>
                    <data>
                        <field index="settings.persistenceIdentifier">
                            <value index="vDEF">egon</value>
                        </field>
                    </data>
                </T3FlexForms>'
            ],
            'inputWithPrecedingWhitespaces' => [
                '
                <?xml version="1.0" encoding="utf-8" standalone="yes" ?>
                <T3FlexForms>
                    <data>
                        <field index="settings.persistenceIdentifier">
                            <value index="vDEF">egon</value>
                        </field>
                    </data>
                </T3FlexForms>'
            ],
            'inputWithTrailingWhitespaces' => [
                '<?xml version="1.0" encoding="utf-8" standalone="yes" ?>
                <T3FlexForms>
                    <data>
                        <field index="settings.persistenceIdentifier">
                            <value index="vDEF">egon</value>
                        </field>
                    </data>
                </T3FlexForms>
                '
            ],
            'inputWithPrecedingAndTrailingWhitespaces' => [
                '
                <?xml version="1.0" encoding="utf-8" standalone="yes" ?>
                <T3FlexForms>
                    <data>
                        <field index="settings.persistenceIdentifier">
                            <value index="vDEF">egon</value>
                        </field>
                    </data>
                </T3FlexForms>
                '
            ],
        ];
    }

    /**
     * @test
     * @dataProvider providerForXml2Array
     * @param string $input
     */
    public function xml2ArrayDealsProperlyWithWhitespace(string $input)
    {
        $expected = [
            'data' => [
                'settings.persistenceIdentifier' => [
                    'vDEF' => 'egon',
                ]
            ],
        ];
        $this->assertSame($expected, GeneralUtility::xml2array($input));
    }

    /**
     * @test
     * @dataProvider idnaEncodeDataProvider
     * @param $actual
     * @param $expected
     */
    public function idnaEncodeConvertsUnicodeCharsToASCIIString($actual, $expected)
    {
        $result = GeneralUtility::idnaEncode($actual);
        $this->assertSame($expected, $result);
    }

    /**
     * Data provider for method idnaEncode in GeneralUtility class.
     * IDNA converter has to convert special chars (UTF-8) to ASCII compatible chars.
     *
     * @returns array
     */
    public function idnaEncodeDataProvider()
    {
        return [
            'empty string' => [
                '',
                ''
            ],
            'null value' => [
                null,
                ''
            ],
            'string with ascii chars' => [
                'example',
                'example'
            ],
            'domain (1) with utf8 chars' => [
                'dömäin.example',
                'xn--dmin-moa0i.example'
            ],
            'domain (2) with utf8 chars' => [
                'äaaa.example',
                'xn--aaa-pla.example'
            ],
            'domain (3) with utf8 chars' => [
                'déjà.vu.example',
                'xn--dj-kia8a.vu.example'
            ],
            'domain (4) with utf8 chars' => [
                'foo.âbcdéf.example',
                'foo.xn--bcdf-9na9b.example'
            ],
            'domain with utf8 char (german umlaut)' => [
                'exömple.com',
                'xn--exmple-xxa.com'
            ],
            'email with utf8 char (german umlaut)' => [
                'joe.doe@dömäin.de',
                'joe.doe@xn--dmin-moa0i.de'
            ]
        ];
    }
}
