ChainCacheClearer example

        @unlink(self::$cacheDir);
    }

    public function testInjectClearersInConstructor()
    {
        $clearer = $this->createMock(CacheClearerInterface::class);
        $clearer
            ->expects($this->once())
            ->method('clear');

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