How can ExecutionContext be injected on Play Framework tests? - scala

Question

I want to create tests for my Play Framework Application and I continue getting java.lang.RuntimeException: There is no started application. I have an Asynchronous Controller like this:
class ComputerController #Inject()(computerService: ComputerService)(implicit executionContext: ExecutionContext){
def add = Action.async {
ComputerForm.form.bindFromRequest.fold(
errorForm => Future.successful(Ok(errorForm.toString)),
data => {
val ip = data.ip
val name = data.name
val user = data.user
val password = data.password
val computer = Computer(ip,name,user,password)
val futureTask = computerService.add(newComputer)
futureTask.map(res => Redirect(routes.HomeController.home()))
}
)
}
}
A helper trait for injecting:
trait Inject {
val injector = new GuiceApplicationBuilder()
.in(new File("conf/application.conf").
.in(Mode.Test)
.injector
}
And the tests is like this:
class ComputerControllerSpec extends PlaySpec with Inject with MockitoSugar with ScalaFutures {
lazy val computerService = mock[ComputerService]
when(computerService.add(any[Computer])) thenReturn Future.successful("Computer added")
implicit lazy val executionContext = injector.instanceOf[ExecutionContext]
val controller = new ComputerController(computerService)
"Computer Controller" should {
"add a new computer" in {
val computer = ComputerFormData("127.0.0.1","Computer","user","password")
val computerForm = ComputerForm.form.fill(computer)
val result = controller.add.apply {
FakeRequest()
.withFormUrlEncodedBody(computerForm.data.toSeq: _*)
}
val bodyText = contentAsString(result)
bodyText mustBe ""
}
}
}
I have also tried:
Initializing the executionContext implicit value with ExecutionContext.global instead and got java.lang.RuntimeException: There is no started application.
Adding with OneAppPerSuite to ComputerControllerSpec and got: akka.actor.OneForOneStrategy - Cannot initialize ExecutionContext; AsyncExecutor already shut down
Changing "add a new computer" in { for "add a new computer" in new WithApplication { and got: java.lang.RuntimeException: There is no started application
I don't really know how to inject that implicit ExecutionContext to my tests.

Answer 1

I guess you are missing "new WithApplication()"
Try this
class ComputerControllerSpec extends PlaySpec with Inject with MockitoSugar with ScalaFutures {
lazy val computerService = mock[ComputerService]
when(computerService.add(any[Computer])) thenReturn Future.successful("Computer added")
implicit lazy val executionContext = injector.instanceOf[ExecutionContext]
val controller = new ComputerController(computerService)
"Computer Controller" should {
"add a new computer" in new WithApplication() {
val computer = ComputerFormData("127.0.0.1","Computer","user","password")
val computerForm = ComputerForm.form.fill(computer)
val result = controller.add.apply {
FakeRequest()
.withFormUrlEncodedBody(computerForm.data.toSeq: _*)
}
val bodyText = contentAsString(result)
bodyText mustBe ""
}
}
}

Answer 2

The way this test got to work was:
Extending PlaySpec with MockitoSugar and BeforeAndAfterAll
Overwriting:
// Before all the tests, start the fake Play application
override def beforeAll() {
application.startPlay()
}
// After the tests execution, shut down the fake application
override def afterAll() {
application.stopPlay()
}
And then all the tests run without the thrown exception.