Edit: ChainCacheClearerTest.php

Editing: ChainCacheClearerTest.php

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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\HttpKernel\Tests\CacheClearer;

use Symfony\Component\HttpKernel\CacheClearer\CacheClearerInterface;
use Symfony\Component\HttpKernel\CacheClearer\ChainCacheClearer;

class ChainCacheClearerTest extends \PHPUnit_Framework_TestCase
{
    protected static $cacheDir;

public static function setUpBeforeClass()
    {
        self::$cacheDir = tempnam(sys_get_temp_dir(), 'sf2_cache_clearer_dir');
    }

public static function tearDownAfterClass()
    {
        @unlink(self::$cacheDir);
    }

public function testInjectClearersInConstructor()
    {
        $clearer = $this->getMockClearer();
        $clearer
            ->expects($this->once())
            ->method('clear');

$chainClearer = new ChainCacheClearer(array($clearer));
        $chainClearer->clear(self::$cacheDir);
    }

public function testInjectClearerUsingAdd()
    {
        $clearer = $this->getMockClearer();
        $clearer
            ->expects($this->once())
            ->method('clear');

$chainClearer = new ChainCacheClearer();
        $chainClearer->add($clearer);
        $chainClearer->clear(self::$cacheDir);
    }

protected function getMockClearer()
    {
        return $this->getMock('Symfony\Component\HttpKernel\CacheClearer\CacheClearerInterface');
    }
}