tests/phpunit/includes/libs/objectcache/CachedBagOStuffTest.php

   1 <?php
   2
   3 /**
   4  * @group BagOStuff
   5  */
   6 class CachedBagOStuffTest extends PHPUnit_Framework_TestCase {
   7
   8         /**
   9          * @covers CachedBagOStuff::__construct
  10          * @covers CachedBagOStuff::doGet
  11          */
  12         public function testGetFromBackend() {
  13                 $backend = new HashBagOStuff;
  14                 $cache = new CachedBagOStuff( $backend );
  15
  16                 $backend->set( 'foo', 'bar' );
  17                 $this->assertEquals( 'bar', $cache->get( 'foo' ) );
  18
  19                 $backend->set( 'foo', 'baz' );
  20                 $this->assertEquals( 'bar', $cache->get( 'foo' ), 'cached' );
  21         }
  22
  23         /**
  24          * @covers CachedBagOStuff::set
  25          * @covers CachedBagOStuff::delete
  26          */
  27         public function testSetAndDelete() {
  28                 $backend = new HashBagOStuff;
  29                 $cache = new CachedBagOStuff( $backend );
  30
  31                 for ( $i = 0; $i < 10; $i++ ) {
  32                         $cache->set( "key$i", 1 );
  33                         $this->assertEquals( 1, $cache->get( "key$i" ) );
  34                         $this->assertEquals( 1, $backend->get( "key$i" ) );
  35                         $cache->delete( "key$i" );
  36                         $this->assertEquals( false, $cache->get( "key$i" ) );
  37                         $this->assertEquals( false, $backend->get( "key$i" ) );
  38                 }
  39         }
  40
  41         /**
  42          * @covers CachedBagOStuff::set
  43          * @covers CachedBagOStuff::delete
  44          */
  45         public function testWriteCacheOnly() {
  46                 $backend = new HashBagOStuff;
  47                 $cache = new CachedBagOStuff( $backend );
  48
  49                 $cache->set( 'foo', 'bar', 0, CachedBagOStuff::WRITE_CACHE_ONLY );
  50                 $this->assertEquals( 'bar', $cache->get( 'foo' ) );
  51                 $this->assertFalse( $backend->get( 'foo' ) );
  52
  53                 $cache->set( 'foo', 'old' );
  54                 $this->assertEquals( 'old', $cache->get( 'foo' ) );
  55                 $this->assertEquals( 'old', $backend->get( 'foo' ) );
  56
  57                 $cache->set( 'foo', 'new', 0, CachedBagOStuff::WRITE_CACHE_ONLY );
  58                 $this->assertEquals( 'new', $cache->get( 'foo' ) );
  59                 $this->assertEquals( 'old', $backend->get( 'foo' ) );
  60
  61                 $cache->delete( 'foo', CachedBagOStuff::WRITE_CACHE_ONLY );
  62                 $this->assertEquals( 'old', $cache->get( 'foo' ) ); // Reloaded from backend
  63         }
  64
  65         /**
  66          * @covers CachedBagOStuff::doGet
  67          */
  68         public function testCacheBackendMisses() {
  69                 $backend = new HashBagOStuff;
  70                 $cache = new CachedBagOStuff( $backend );
  71
  72                 // First hit primes the cache with miss from the backend
  73                 $this->assertEquals( false, $cache->get( 'foo' ) );
  74
  75                 // Change the value in the backend
  76                 $backend->set( 'foo', true );
  77
  78                 // Second hit returns the cached miss
  79                 $this->assertEquals( false, $cache->get( 'foo' ) );
  80
  81                 // But a fresh value is read from the backend
  82                 $backend->set( 'bar', true );
  83                 $this->assertEquals( true, $cache->get( 'bar' ) );
  84         }
  85 }