CachedBagOStuffTest.php

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<?php
 
class CachedBagOStuffTest extends PHPUnit_Framework_TestCase {
 
    public function testGetFromBackend() {
        $backend = new HashBagOStuff;
        $cache = new CachedBagOStuff( $backend );
 
        $backend->set( 'foo', 'bar' );
        $this->assertEquals( 'bar', $cache->get( 'foo' ) );
 
        $backend->set( 'foo', 'baz' );
        $this->assertEquals( 'bar', $cache->get( 'foo' ), 'cached' );
    }
 
    public function testSetAndDelete() {
        $backend = new HashBagOStuff;
        $cache = new CachedBagOStuff( $backend );
 
        for ( $i = 0; $i < 10; $i++ ) {
            $cache->set( "key$i", 1 );
            $this->assertEquals( 1, $cache->get( "key$i" ) );
            $this->assertEquals( 1, $backend->get( "key$i" ) );
            $cache->delete( "key$i" );
            $this->assertEquals( false, $cache->get( "key$i" ) );
            $this->assertEquals( false, $backend->get( "key$i" ) );
        }
    }
 
    public function testWriteCacheOnly() {
        $backend = new HashBagOStuff;
        $cache = new CachedBagOStuff( $backend );
 
        $cache->set( 'foo', 'bar', 0, CachedBagOStuff::WRITE_CACHE_ONLY );
        $this->assertEquals( 'bar', $cache->get( 'foo' ) );
        $this->assertFalse( $backend->get( 'foo' ) );
 
        $cache->set( 'foo', 'old' );
        $this->assertEquals( 'old', $cache->get( 'foo' ) );
        $this->assertEquals( 'old', $backend->get( 'foo' ) );
 
        $cache->set( 'foo', 'new', 0, CachedBagOStuff::WRITE_CACHE_ONLY );
        $this->assertEquals( 'new', $cache->get( 'foo' ) );
        $this->assertEquals( 'old', $backend->get( 'foo' ) );
 
        $cache->delete( 'foo', CachedBagOStuff::WRITE_CACHE_ONLY );
        $this->assertEquals( 'old', $cache->get( 'foo' ) ); // Reloaded from backend
    }
 
    public function testCacheBackendMisses() {
        $backend = new HashBagOStuff;
        $cache = new CachedBagOStuff( $backend );
 
        // First hit primes the cache with miss from the backend
        $this->assertEquals( false, $cache->get( 'foo' ) );
 
        // Change the value in the backend
        $backend->set( 'foo', true );
 
        // Second hit returns the cached miss
        $this->assertEquals( false, $cache->get( 'foo' ) );
 
        // But a fresh value is read from the backend
        $backend->set( 'bar', true );
        $this->assertEquals( true, $cache->get( 'bar' ) );
    }
}