RedisBackendTest.php

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<?php
namespace ‪TYPO3\CMS\Core\Tests\Functional\Cache\Backend;
 
/*
 * 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 Psr\Log\LoggerInterface;
use ‪TYPO3\CMS\Core\Cache\Backend\RedisBackend;
use ‪TYPO3\CMS\Core\Cache\Exception\InvalidDataException;
use ‪TYPO3\CMS\Core\Cache\Frontend\FrontendInterface;
use TYPO3\TestingFramework\Core\Functional\FunctionalTestCase;
 
class ‪RedisBackendTest extends FunctionalTestCase
{
    protected function ‪setUp()
    {
        if (!getenv('typo3TestingRedisHost')) {
            $this->markTestSkipped('environment variable "typo3TestingRedisHost" must be set to run this test');
        }
        // Note we assume that if that typo3TestingRedisHost env is set, we can use that for testing,
        // there is no test to see if the daemon is actually up and running. Tests will fail if env
        // is set but daemon is down.
 
        parent::setUp();
    }
 
    protected function ‪setUpSubject(array $backendOptions = []): ‪RedisBackend
    {
        // We know this env is set, otherwise setUp() would skip the tests
        $backendOptions['hostname'] = getenv('typo3TestingRedisHost');
        // If typo3TestingRedisPort env is set, use it, otherwise fall back to standard port
        $env = getenv('typo3TestingRedisPort');
        $backendOptions['port'] = is_string($env) ? (int)$env : 6379;
 
        $frontendProphecy = $this->prophesize(FrontendInterface::class);
        $frontendProphecy->getIdentifier()->willReturn('cache_pages');
 
        ‪$GLOBALS['TYPO3_CONF_VARS']['LOG'] = 'only needed for logger initialisation';
        $subject = new ‪RedisBackend('Testing', $backendOptions);
        $subject->setLogger($this->prophesize(LoggerInterface::class)->reveal());
        $subject->setCache($frontendProphecy->reveal());
        $subject->initializeObject();
        $subject->flush();
        return $subject;
    }
 
    protected function ‪setUpRedis(): \Redis
    {
        // We know this env is set, otherwise setUp() would skip the tests
        $redisHost = getenv('typo3TestingRedisHost');
        // If typo3TestingRedisPort env is set, use it, otherwise fall back to standard port
        $env = getenv('typo3TestingRedisPort');
        $redisPort = is_string($env) ? (int)$env : 6379;
 
        $redis = new \Redis();
        $redis->connect($redisHost, $redisPort);
        return $redis;
    }
 
    public function ‪setDatabaseThrowsExceptionIfGivenDatabaseNumberIsNotAnInteger()
    {
        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionCode(1279763057);
 
        $this->‪setUpSubject(['database' => 'foo']);
    }
 
    public function ‪setDatabaseThrowsExceptionIfGivenDatabaseNumberIsNegative()
    {
        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionCode(1279763534);
 
        $this->‪setUpSubject(['database' => -1]);
    }
 
    public function ‪setCompressionThrowsExceptionIfCompressionParameterIsNotOfTypeBoolean()
    {
        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionCode(1289679153);
 
        $this->‪setUpSubject(['compression' => 'foo']);
    }
 
    public function ‪setCompressionLevelThrowsExceptionIfCompressionLevelIsNotInteger()
    {
        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionCode(1289679154);
 
        $this->‪setUpSubject(['compressionLevel' => 'foo']);
    }
 
    public function ‪setCompressionLevelThrowsExceptionIfCompressionLevelIsNotBetweenMinusOneAndNine()
    {
        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionCode(1289679155);
 
        $this->‪setUpSubject(['compressionLevel' => 11]);
    }
 
    public function ‪setConnectionTimeoutThrowsExceptionIfConnectionTimeoutIsNotInteger()
    {
        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionCode(1487849315);
 
        $this->‪setUpSubject(['connectionTimeout' => 'foo']);
    }
 
    public function ‪setConnectionTimeoutThrowsExceptionIfConnectionTimeoutIsNegative()
    {
        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionCode(1487849326);
 
        $this->‪setUpSubject(['connectionTimeout' => -1]);
    }
 
    public function ‪setThrowsExceptionIfIdentifierIsNotAString()
    {
        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionCode(1377006651);
 
        $subject = $this->‪setUpSubject();
        $subject->set([], 'data');
    }
 
    public function ‪setThrowsExceptionIfDataIsNotAString()
    {
        $this->expectException(InvalidDataException::class);
        $this->expectExceptionCode(1279469941);
 
        $subject = $this->‪setUpSubject();
        $subject->set($this->getUniqueId('identifier'), []);
    }
 
    public function ‪setThrowsExceptionIfLifetimeIsNegative()
    {
        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionCode(1279487573);
 
        $subject = $this->‪setUpSubject();
        $subject->set($this->getUniqueId('identifier'), 'data', [], -42);
    }
 
    public function ‪setThrowsExceptionIfLifetimeIsNotNullOrAnInteger()
    {
        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionCode(1279488008);
 
        $subject = $this->‪setUpSubject();
        $subject->set($this->getUniqueId('identifier'), 'data', [], []);
    }
 
    public function ‪setStoresEntriesInSelectedDatabase()
    {
        $redis = $this->‪setUpRedis();
        $redis->select(1);
        $subject = $this->‪setUpSubject(['database' => 1]);
        $identifier = $this->getUniqueId('identifier');
        $subject->set($identifier, 'data');
        $result = $redis->exists('identData:' . $identifier);
        if (is_int($result)) {
            // Since 3.1.4 of phpredis/phpredis the return types has been changed
            $result = (bool)$result;
        }
        $this->assertTrue($result);
    }
 
    public function ‪setSavesStringDataTypeForIdentifierToDataEntry()
    {
        $subject = $this->‪setUpSubject();
        $redis = $this->‪setUpRedis();
        $identifier = $this->getUniqueId('identifier');
        $subject->set($identifier, 'data');
        $this->assertSame(\Redis::REDIS_STRING, $redis->type('identData:' . $identifier));
    }
 
    public function ‪setSavesEntryWithDefaultLifeTime()
    {
        $subject = $this->‪setUpSubject();
        $redis = $this->‪setUpRedis();
        $identifier = $this->getUniqueId('identifier');
        $defaultLifetime = 42;
        $subject->setDefaultLifetime($defaultLifetime);
        $subject->set($identifier, 'data');
        $lifetimeRegisteredInBackend = $redis->ttl('identData:' . $identifier);
        $this->assertSame($defaultLifetime, $lifetimeRegisteredInBackend);
    }
 
    public function ‪setSavesEntryWithSpecifiedLifeTime()
    {
        $subject = $this->‪setUpSubject();
        $redis = $this->‪setUpRedis();
        $identifier = $this->getUniqueId('identifier');
        $lifetime = 43;
        $subject->set($identifier, 'data', [], $lifetime);
        $lifetimeRegisteredInBackend = $redis->ttl('identData:' . $identifier);
        $this->assertSame($lifetime, $lifetimeRegisteredInBackend);
    }
 
    public function ‪setSavesEntryWithUnlimitedLifeTime()
    {
        $subject = $this->‪setUpSubject();
        $redis = $this->‪setUpRedis();
        $identifier = $this->getUniqueId('identifier');
        $subject->set($identifier, 'data', [], 0);
        $lifetimeRegisteredInBackend = $redis->ttl('identData:' . $identifier);
        $this->assertSame(31536000, $lifetimeRegisteredInBackend);
    }
 
    public function ‪setOverwritesExistingEntryWithNewData()
    {
        $subject = $this->‪setUpSubject();
        $data = 'data 1';
        $identifier = $this->getUniqueId('identifier');
        $subject->set($identifier, $data);
        $otherData = 'data 2';
        $subject->set($identifier, $otherData);
        $fetchedData = $subject->get($identifier);
        $this->assertSame($otherData, $fetchedData);
    }
 
    public function ‪setOverwritesExistingEntryWithSpecifiedLifetime()
    {
        $subject = $this->‪setUpSubject();
        $redis = $this->‪setUpRedis();
        $data = 'data';
        $identifier = $this->getUniqueId('identifier');
        $subject->set($identifier, $data);
        $lifetime = 42;
        $subject->set($identifier, $data, [], $lifetime);
        $lifetimeRegisteredInBackend = $redis->ttl('identData:' . $identifier);
        $this->assertSame($lifetime, $lifetimeRegisteredInBackend);
    }
 
    public function ‪setOverwritesExistingEntryWithNewDefaultLifetime()
    {
        $subject = $this->‪setUpSubject();
        $redis = $this->‪setUpRedis();
        $data = 'data';
        $identifier = $this->getUniqueId('identifier');
        $lifetime = 42;
        $subject->set($identifier, $data, [], $lifetime);
        $newDefaultLifetime = 43;
        $subject->setDefaultLifetime($newDefaultLifetime);
        $subject->set($identifier, $data, [], $newDefaultLifetime);
        $lifetimeRegisteredInBackend = $redis->ttl('identData:' . $identifier);
        $this->assertSame($newDefaultLifetime, $lifetimeRegisteredInBackend);
    }
 
    public function ‪setOverwritesExistingEntryWithNewUnlimitedLifetime()
    {
        $subject = $this->‪setUpSubject();
        $redis = $this->‪setUpRedis();
        $data = 'data';
        $identifier = $this->getUniqueId('identifier');
        $lifetime = 42;
        $subject->set($identifier, $data, [], $lifetime);
        $subject->set($identifier, $data, [], 0);
        $lifetimeRegisteredInBackend = $redis->ttl('identData:' . $identifier);
        $this->assertSame(31536000, $lifetimeRegisteredInBackend);
    }
 
    public function ‪setSavesSetDataTypeForIdentifierToTagsSet()
    {
        $subject = $this->‪setUpSubject();
        $redis = $this->‪setUpRedis();
        $identifier = $this->getUniqueId('identifier');
        $subject->set($identifier, 'data', ['tag']);
        $this->assertSame(\Redis::REDIS_SET, $redis->type('identTags:' . $identifier));
    }
 
    public function ‪setSavesSpecifiedTagsInIdentifierToTagsSet()
    {
        $subject = $this->‪setUpSubject();
        $redis = $this->‪setUpRedis();
        $identifier = $this->getUniqueId('identifier');
        $tags = ['thatTag', 'thisTag'];
        $subject->set($identifier, 'data', $tags);
        $savedTags = $redis->sMembers('identTags:' . $identifier);
        sort($savedTags);
        $this->assertSame($tags, $savedTags);
    }
 
    public function ‪setRemovesAllPreviouslySetTagsFromIdentifierToTagsSet()
    {
        $subject = $this->‪setUpSubject();
        $redis = $this->‪setUpRedis();
        $identifier = $this->getUniqueId('identifier');
        $tags = ['fooTag', 'barTag'];
        $subject->set($identifier, 'data', $tags);
        $subject->set($identifier, 'data', []);
        $this->assertSame([], $redis->sMembers('identTags:' . $identifier));
    }
 
    public function ‪setRemovesMultiplePreviouslySetTagsFromIdentifierToTagsSet()
    {
        $subject = $this->‪setUpSubject();
        $redis = $this->‪setUpRedis();
        $identifier = $this->getUniqueId('identifier');
        $firstTagSet = ['tag1', 'tag2', 'tag3', 'tag4'];
        $subject->set($identifier, 'data', $firstTagSet);
        $secondTagSet = ['tag1', 'tag3'];
        $subject->set($identifier, 'data', $secondTagSet);
        $actualTagSet = $redis->sMembers('identTags:' . $identifier);
        sort($actualTagSet);
        $this->assertSame($secondTagSet, $actualTagSet);
    }
 
    public function ‪setSavesSetDataTypeForTagToIdentifiersSet()
    {
        $subject = $this->‪setUpSubject();
        $redis = $this->‪setUpRedis();
        $identifier = $this->getUniqueId('identifier');
        $tag = 'tag';
        $subject->set($identifier, 'data', [$tag]);
        $this->assertSame(\Redis::REDIS_SET, $redis->type('tagIdents:' . $tag));
    }
 
    public function ‪setSavesIdentifierInTagToIdentifiersSetOfSpecifiedTag()
    {
        $subject = $this->‪setUpSubject();
        $redis = $this->‪setUpRedis();
        $identifier = $this->getUniqueId('identifier');
        $tag = 'thisTag';
        $subject->set($identifier, 'data', [$tag]);
        $savedTagToIdentifiersMemberArray = $redis->sMembers('tagIdents:' . $tag);
        $this->assertSame([$identifier], $savedTagToIdentifiersMemberArray);
    }
 
    public function ‪setAppendsSecondIdentifierInTagToIdentifiersEntry()
    {
        $subject = $this->‪setUpSubject();
        $redis = $this->‪setUpRedis();
        $firstIdentifier = $this->getUniqueId('identifier1-');
        $tag = 'thisTag';
        $subject->set($firstIdentifier, 'data', [$tag]);
        $secondIdentifier = $this->getUniqueId('identifier2-');
        $subject->set($secondIdentifier, 'data', [$tag]);
        $savedTagToIdentifiersMemberArray = $redis->sMembers('tagIdents:' . $tag);
        sort($savedTagToIdentifiersMemberArray);
        $identifierArray = [$firstIdentifier, $secondIdentifier];
        sort($identifierArray);
        $this->assertSame([$firstIdentifier, $secondIdentifier], $savedTagToIdentifiersMemberArray);
    }
 
    public function ‪setRemovesIdentifierFromTagToIdentifiersEntryIfTagIsOmittedOnConsecutiveSet()
    {
        $subject = $this->‪setUpSubject();
        $redis = $this->‪setUpRedis();
        $identifier = $this->getUniqueId('identifier');
        $tag = 'thisTag';
        $subject->set($identifier, 'data', [$tag]);
        $subject->set($identifier, 'data', []);
        $savedTagToIdentifiersMemberArray = $redis->sMembers('tagIdents:' . $tag);
        $this->assertSame([], $savedTagToIdentifiersMemberArray);
    }
 
    public function ‪setAddsIdentifierInTagToIdentifiersEntryIfTagIsAddedOnConsecutiveSet()
    {
        $subject = $this->‪setUpSubject();
        $redis = $this->‪setUpRedis();
        $identifier = $this->getUniqueId('identifier');
        $subject->set($identifier, 'data');
        $tag = 'thisTag';
        $subject->set($identifier, 'data', [$tag]);
        $savedTagToIdentifiersMemberArray = $redis->sMembers('tagIdents:' . $tag);
        $this->assertSame([$identifier], $savedTagToIdentifiersMemberArray);
    }
 
    public function ‪setSavesCompressedDataWithEnabledCompression()
    {
        $subject = $this->‪setUpSubject([
            'compression' => true
        ]);
        $redis = $this->‪setUpRedis();
        $identifier = $this->getUniqueId('identifier');
        $data = 'some data ' . microtime();
        $subject->set($identifier, $data);
        $uncompresedStoredData = '';
        try {
            $uncompresedStoredData = @gzuncompress($redis->get('identData:' . $identifier));
        } catch (\‪Exception $e) {
        }
        $this->assertEquals($data, $uncompresedStoredData, 'Original and compressed data don\'t match');
    }
 
    public function ‪setSavesPlaintextDataWithEnabledCompressionAndCompressionLevel0()
    {
        $subject = $this->‪setUpSubject([
            'compression' => true,
            'compressionLevel' => 0
        ]);
        $redis = $this->‪setUpRedis();
        $identifier = $this->getUniqueId('identifier');
        $data = 'some data ' . microtime();
        $subject->set($identifier, $data);
        $this->assertGreaterThan(0, substr_count($redis->get('identData:' . $identifier), $data), 'Plaintext data not found');
    }
 
    public function ‪hasThrowsExceptionIfIdentifierIsNotAString()
    {
        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionCode(1377006653);
 
        $subject = $this->‪setUpSubject();
        $subject->has([]);
    }
 
    public function ‪hasReturnsFalseForNotExistingEntry()
    {
        $subject = $this->‪setUpSubject();
        $identifier = $this->getUniqueId('identifier');
        $this->assertFalse($subject->has($identifier));
    }
 
    public function ‪hasReturnsTrueForPreviouslySetEntry()
    {
        $subject = $this->‪setUpSubject();
        $identifier = $this->getUniqueId('identifier');
        $subject->set($identifier, 'data');
        $this->assertTrue($subject->has($identifier));
    }
 
    public function ‪getThrowsExceptionIfIdentifierIsNotAString()
    {
        $this->expectException(\InvalidArgumentException::class);
        //@todo Add exception code with redis extension
 
        $subject = $this->‪setUpSubject();
        $subject->get([]);
    }
 
    public function ‪getReturnsPreviouslyCompressedSetEntry()
    {
        $subject = $this->‪setUpSubject([
            'compression' => true
        ]);
        $data = 'data';
        $identifier = $this->getUniqueId('identifier');
        $subject->set($identifier, $data);
        $fetchedData = $subject->get($identifier);
        $this->assertSame($data, $fetchedData);
    }
 
    public function ‪getReturnsPreviouslySetEntry()
    {
        $subject = $this->‪setUpSubject();
        $data = 'data';
        $identifier = $this->getUniqueId('identifier');
        $subject->set($identifier, $data);
        $fetchedData = $subject->get($identifier);
        $this->assertSame($data, $fetchedData);
    }
 
    public function ‪removeThrowsExceptionIfIdentifierIsNotAString()
    {
        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionCode(1377006654);
 
        $subject = $this->‪setUpSubject();
        $subject->remove([]);
    }
 
    public function ‪removeReturnsFalseIfNoEntryWasDeleted()
    {
        $subject = $this->‪setUpSubject();
        $this->assertFalse($subject->remove($this->getUniqueId('identifier')));
    }
 
    public function ‪removeReturnsTrueIfAnEntryWasDeleted()
    {
        $subject = $this->‪setUpSubject();
        $identifier = $this->getUniqueId('identifier');
        $subject->set($identifier, 'data');
        $this->assertTrue($subject->remove($identifier));
    }
 
    public function ‪removeDeletesEntryFromCache()
    {
        $subject = $this->‪setUpSubject();
        $identifier = $this->getUniqueId('identifier');
        $subject->set($identifier, 'data');
        $subject->remove($identifier);
        $this->assertFalse($subject->has($identifier));
    }
 
    public function ‪removeDeletesIdentifierToTagEntry()
    {
        $subject = $this->‪setUpSubject();
        $redis = $this->‪setUpRedis();
        $identifier = $this->getUniqueId('identifier');
        $tag = 'thisTag';
        $subject->set($identifier, 'data', [$tag]);
        $subject->remove($identifier);
        $result = $redis->exists('identTags:' . $identifier);
        if (is_int($result)) {
            // Since 3.1.4 of phpredis/phpredis the return types has been changed
            $result = (bool)$result;
        }
        $this->assertFalse($result);
    }
 
    public function ‪removeDeletesIdentifierFromTagToIdentifiersSet()
    {
        $subject = $this->‪setUpSubject();
        $redis = $this->‪setUpRedis();
        $identifier = $this->getUniqueId('identifier');
        $tag = 'thisTag';
        $subject->set($identifier, 'data', [$tag]);
        $subject->remove($identifier);
        $tagToIdentifiersMemberArray = $redis->sMembers('tagIdents:' . $tag);
        $this->assertSame([], $tagToIdentifiersMemberArray);
    }
 
    public function ‪removeDeletesIdentifierFromTagToIdentifiersSetWithMultipleEntries()
    {
        $subject = $this->‪setUpSubject();
        $redis = $this->‪setUpRedis();
        $firstIdentifier = $this->getUniqueId('identifier');
        $secondIdentifier = $this->getUniqueId('identifier');
        $tag = 'thisTag';
        $subject->set($firstIdentifier, 'data', [$tag]);
        $subject->set($secondIdentifier, 'data', [$tag]);
        $subject->remove($firstIdentifier);
        $tagToIdentifiersMemberArray = $redis->sMembers('tagIdents:' . $tag);
        $this->assertSame([$secondIdentifier], $tagToIdentifiersMemberArray);
    }
 
    public function ‪findIdentifiersByTagThrowsExceptionIfTagIsNotAString()
    {
        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionCode(1377006655);
 
        $subject = $this->‪setUpSubject();
        $subject->findIdentifiersByTag([]);
    }
 
    public function ‪findIdentifiersByTagReturnsEmptyArrayForNotExistingTag()
    {
        $subject = $this->‪setUpSubject();
        $this->assertSame([], $subject->findIdentifiersByTag('thisTag'));
    }
 
    public function ‪findIdentifiersByTagReturnsAllIdentifiersTagedWithSpecifiedTag()
    {
        $subject = $this->‪setUpSubject();
        $firstIdentifier = $this->getUniqueId('identifier1-');
        $secondIdentifier = $this->getUniqueId('identifier2-');
        $thirdIdentifier = $this->getUniqueId('identifier3-');
        $tagsForFirstIdentifier = ['thisTag'];
        $tagsForSecondIdentifier = ['thatTag'];
        $tagsForThirdIdentifier = ['thisTag', 'thatTag'];
        $subject->set($firstIdentifier, 'data', $tagsForFirstIdentifier);
        $subject->set($secondIdentifier, 'data', $tagsForSecondIdentifier);
        $subject->set($thirdIdentifier, 'data', $tagsForThirdIdentifier);
        $expectedResult = [$firstIdentifier, $thirdIdentifier];
        $actualResult = $subject->findIdentifiersByTag('thisTag');
        sort($actualResult);
        $this->assertSame($expectedResult, $actualResult);
    }
 
    public function ‪flushRemovesAllEntriesFromCache()
    {
        $subject = $this->‪setUpSubject();
        $redis = $this->‪setUpRedis();
        $identifier = $this->getUniqueId('identifier');
        $subject->set($identifier, 'data');
        $subject->flush();
        $this->assertSame([], $redis->getKeys('*'));
    }
 
    public function ‪flushByTagThrowsExceptionIfTagIsNotAString()
    {
        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionCode(1377006656);
 
        $subject = $this->‪setUpSubject();
        $subject->flushByTag([]);
    }
 
    public function ‪flushByTagRemovesEntriesTaggedWithSpecifiedTag()
    {
        $subject = $this->‪setUpSubject();
        $identifier = $this->getUniqueId('identifier');
        $subject->set($identifier . 'A', 'data', ['tag1']);
        $subject->set($identifier . 'B', 'data', ['tag2']);
        $subject->set($identifier . 'C', 'data', ['tag1', 'tag2']);
        $subject->flushByTag('tag1');
        $expectedResult = [false, true, false];
        $actualResult = [
            $subject->has($identifier . 'A'),
            $subject->has($identifier . 'B'),
            $subject->has($identifier . 'C')
        ];
        $this->assertSame($expectedResult, $actualResult);
    }
 
    public function ‪flushByTagsRemovesEntriesTaggedWithSpecifiedTags()
    {
        $subject = $this->‪setUpSubject();
        $identifier = $this->getUniqueId('identifier');
        $subject->set($identifier . 'A', 'data', ['tag1']);
        $subject->set($identifier . 'B', 'data', ['tag2']);
        $subject->set($identifier . 'C', 'data', ['tag1', 'tag2']);
        $subject->set($identifier . 'D', 'data', ['tag3']);
        $subject->flushByTags(['tag1', 'tag2']);
        $expectedResult = [false, false, false, true];
        $actualResult = [
            $subject->has($identifier . 'A'),
            $subject->has($identifier . 'B'),
            $subject->has($identifier . 'C'),
            $subject->has($identifier . 'D')
        ];
        $this->assertSame($expectedResult, $actualResult);
    }
 
    public function ‪flushByTagRemovesTemporarySet()
    {
        $subject = $this->‪setUpSubject();
        $redis = $this->‪setUpRedis();
        $identifier = $this->getUniqueId('identifier');
        $subject->set($identifier . 'A', 'data', ['tag1']);
        $subject->set($identifier . 'C', 'data', ['tag1', 'tag2']);
        $subject->flushByTag('tag1');
        $this->assertSame([], $redis->getKeys('temp*'));
    }
 
    public function ‪flushByTagRemovesIdentifierToTagsSetOfEntryTaggedWithGivenTag()
    {
        $subject = $this->‪setUpSubject();
        $redis = $this->‪setUpRedis();
        $identifier = $this->getUniqueId('identifier');
        $tag = 'tag1';
        $subject->set($identifier, 'data', [$tag]);
        $subject->flushByTag($tag);
        $result = $redis->exists('identTags:' . $identifier);
        if (is_int($result)) {
            // Since 3.1.4 of phpredis/phpredis the return types has been changed
            $result = (bool)$result;
        }
        $this->assertFalse($result);
    }
 
    public function ‪flushByTagDoesNotRemoveIdentifierToTagsSetOfUnrelatedEntry()
    {
        $subject = $this->‪setUpSubject();
        $redis = $this->‪setUpRedis();
        $identifierToBeRemoved = $this->getUniqueId('identifier');
        $tagToRemove = 'tag1';
        $subject->set($identifierToBeRemoved, 'data', [$tagToRemove]);
        $identifierNotToBeRemoved = $this->getUniqueId('identifier');
        $tagNotToRemove = 'tag2';
        $subject->set($identifierNotToBeRemoved, 'data', [$tagNotToRemove]);
        $subject->flushByTag($tagToRemove);
        $this->assertSame([$tagNotToRemove], $redis->sMembers('identTags:' . $identifierNotToBeRemoved));
    }
 
    public function ‪flushByTagRemovesTagToIdentifiersSetOfGivenTag()
    {
        $subject = $this->‪setUpSubject();
        $redis = $this->‪setUpRedis();
        $identifier = $this->getUniqueId('identifier');
        $tag = 'tag1';
        $subject->set($identifier, 'data', [$tag]);
        $subject->flushByTag($tag);
        $result = $redis->exists('tagIdents:' . $tag);
        if (is_int($result)) {
            // Since 3.1.4 of phpredis/phpredis the return types has been changed
            $result = (bool)$result;
        }
        $this->assertFalse($result);
    }
 
    public function ‪flushByTagRemovesIdentifiersTaggedWithGivenTagFromTagToIdentifiersSets()
    {
        $subject = $this->‪setUpSubject();
        $redis = $this->‪setUpRedis();
        $identifier = $this->getUniqueId('identifier');
        $subject->set($identifier . 'A', 'data', ['tag1', 'tag2']);
        $subject->set($identifier . 'B', 'data', ['tag1', 'tag2']);
        $subject->set($identifier . 'C', 'data', ['tag2']);
        $subject->flushByTag('tag1');
        $this->assertSame([$identifier . 'C'], $redis->sMembers('tagIdents:tag2'));
    }
 
    public function ‪collectGarbageDoesNotRemoveNotExpiredIdentifierToDataEntry()
    {
        $subject = $this->‪setUpSubject();
        $redis = $this->‪setUpRedis();
        $identifier = $this->getUniqueId('identifier');
        $subject->set($identifier . 'A', 'data', ['tag']);
        $subject->set($identifier . 'B', 'data', ['tag']);
        $redis->del('identData:' . $identifier . 'A');
        $subject->collectGarbage();
        $result = $redis->exists('identData:' . $identifier . 'B');
        if (is_int($result)) {
            // Since 3.1.4 of phpredis/phpredis the return types has been changed
            $result = (bool)$result;
        }
        $this->assertTrue($result);
    }
 
    public function ‪collectGarbageRemovesLeftOverIdentifierToTagsSet()
    {
        $subject = $this->‪setUpSubject();
        $redis = $this->‪setUpRedis();
        $identifier = $this->getUniqueId('identifier');
        $subject->set($identifier . 'A', 'data', ['tag']);
        $subject->set($identifier . 'B', 'data', ['tag']);
        $redis->del('identData:' . $identifier . 'A');
        $subject->collectGarbage();
        $expectedResult = [false, true];
        $resultA = $redis->exists('identTags:' . $identifier . 'A');
        $resultB = $redis->exists('identTags:' . $identifier . 'B');
        if (is_int($resultA)) {
            // Since 3.1.4 of phpredis/phpredis the return types has been changed
            $resultA = (bool)$resultA;
        }
        if (is_int($resultB)) {
            // Since 3.1.4 of phpredis/phpredis the return types has been changed
            $resultB = (bool)$resultB;
        }
        $actualResult = [
            $resultA,
            $resultB
        ];
        $this->assertSame($expectedResult, $actualResult);
    }
 
    public function ‪collectGarbageRemovesExpiredIdentifierFromTagsToIdentifierSet()
    {
        $subject = $this->‪setUpSubject();
        $redis = $this->‪setUpRedis();
        $identifier = $this->getUniqueId('identifier');
        $subject->set($identifier . 'A', 'data', ['tag1', 'tag2']);
        $subject->set($identifier . 'B', 'data', ['tag2']);
        $redis->del('identData:' . $identifier . 'A');
        $subject->collectGarbage();
        $expectedResult = [
            [],
            [$identifier . 'B']
        ];
        $actualResult = [
            $redis->sMembers('tagIdents:tag1'),
            $redis->sMembers('tagIdents:tag2')
        ];
        $this->assertSame($expectedResult, $actualResult);
    }
}