If you want to achieve 100% coverage for your whole application you will also have to test your infrastructure. Before doing that, you need to know that those unit tests will be more coupled to your implementation than the business ones. That means that the probability to be broken with implementation details changes is higher. So it is a trade-off you will have to consider.

So, if you want to continue, we need to do some modifications. We need to decouple even more. Let's see the code in Listing 13:

class IdeaController extends Zend_Controller_Action
{
    public function rateAction()
    {
        $ideaId = $this->request->getParam('id');
        $rating = $this->request->getParam('rating');

        $useCase = new RateIdeaUseCase(
            new RedisIdeaRepository(
                new Predis\Client()
            )
        );

        $response = $useCase->execute(
            new RateIdeaRequest($ideaId, $rating)
        );

        $this->redirect...