상속: implements Mongolid\Util\CacheComponentInterface
 public function testShouldCheckIfHave()
 {
     // Set
     $cacheRepo = m::mock(Repository::class);
     $serializer = m::mock(Serializer::class);
     $component = new LaravelCacheComponent($cacheRepo, $serializer);
     $key = 'foo';
     $exists = true;
     // Expectations
     $cacheRepo->shouldReceive('has')->once()->with($key)->andReturn($exists);
     // Assertion
     $this->assertEquals($exists, $component->has($key));
 }