Play Framework 2.4.x -覆盖Guice绑定

Question

我有几个测试用例，有一个测试用例我想测试通知不可用。我使用了一个单独的GuiceInjectorBuilder将通知服务实例注入（覆盖）为None，而不是通常的Some（DefaultNotificationService）

class MySpec extends PlaySpec with Results with OneAppPerSuite {
  def appController = Application.instanceCache[AppController].apply(app)

  // typical case
  "cancel an order" should {
      "return HTTP OK" in {        
        val result: Future[Result] = injector.instanceOf[AppController].cancel(1).apply(FakeRequest())
        status(result) mustEqual OK
        (contentAsJson(result) \ "message").as[String] mustEqual "Order no. 1 is cancelled"
      }
    }

    // exception case 
    "cancel an order but notification service is OUT" should {
      import play.api.inject.bind

      val injector = new GuiceInjectorBuilder()
        .bindings(new MockAppModule)
        .in(Mode.Test)
        .overrides(bind[Option[NotificationService]].toInstance(None))  // usually it is configured to Some(DefaultNotificaionService)
        .injector()

      "return HTTP Multi Status" in {
        val result: Future[Result] = injector.instanceOf[AppController].update(1).apply(FakeRequest())
        status(result) mustEqual MULTI_STATUS
        (contentAsJson(result) \ "message").as[String] mustEqual "Order no. 1 is cancelled but user does not know"
      }
    }

  ...
  }    

它不起作用，因为 MockAppModule 依赖于 Play 在此测试的启动生命周期中注入的其他模块。如何加载这些 Play 默认模块，以便 MockAppModule 适用于此测试用例？有没有更好的方法可以做到这一点？谢谢

Answer 1

如果要对每个测试一个应用而不是每个套件执行此操作，可以尝试像这样重写绑定（可能有与 newAppForTest（） 等效的方法，每个套件使用一个应用执行此操作）：

class MySpec extends PlaySpec with Results with GuiceOneAppPerTest {

implicit override def newAppForTest(testData: TestData): Application = {
    GuiceApplicationBuilder()
        .overrides(bind[Option[NotificationService]].toInstance(None))  // usually it is configured to Some(DefaultNotificaionService)
        .build()
    }
}