public function testFilters()
 {
     $manager = new AssetManager($themeBag = $this->getMockThemeBag(), $viewFinder = m::mock('Cartalyst\\Themes\\Views\\ViewFinderInterface'), $locationGenerator = m::mock('Cartalyst\\Themes\\Locations\\GeneratorInterface'));
     $this->assertCount(0, $manager->getFilterInstances('foo'));
     $manager->addFilter('foo', function () {
         return new FilterStubEmpty();
     });
     $manager->addFilter('foo', function () {
         return new FilterStub();
     });
     $this->assertCount(2, $filters = $manager->getFilterInstances('foo'));
     $this->assertInstanceOf('FilterStubEmpty', reset($filters));
     $this->assertInstanceOf('FilterStub', end($filters));
 }