Play/Scala injecting controller into test

Question

So according to Play 2.4 documentation (https://playframework.com/documentation/2.4.x/ScalaTestingWithScalaTest#Unit-Testing-Controllers), the controller should be set up as a trait like this

trait ExampleController {
  this: Controller =>

  def index() = Action {
    Ok("ok")
  }
}

object ExampleController extends Controller with ExampleController

in order for a test to work like this

class ExampleControllerSpec extends PlaySpec with Results {

  class TestController() extends Controller with ExampleController

  "Example Page#index" should {
    "should be valid" in {
        //test code
    }
  }
}

however, I'm using Guice dependency injection, and according to Play 2.4 documentation (https://playframework.com/documentation/2.4.x/ScalaDependencyInjection) my controller looks like this:

@Singleton
class ExampleController @Inject() (exampleService: IExampleService) extends Controller {
    def index() = Action {
        Ok("")
    }
}

Since controller is no longer a trait and I can't mix it into the test like this: with ExampleController, how do I make the test above work?

Polaroid

Answer 1

You can inherit directly from ExampleController. You can also eliminate the extends Controller, as your controller already inherits this:

class TestController(service: IExampleService) extends ExampleController(service)

You can find more information about testing using Play and Guice here

Kilter

Thanks. By the way, any idea how to inject the service (that is injected into the controller) into the same test as well? – Polaroid

I'd mock out the service, eg: using ScalaMock. – Kilter

I don't understand, what would be the benefit of creating a class TestController and testing it, instead of testing the ExampleController directy? – Freon