在Play 2.6中对控制器进行单元测试 [英] Unit testing a controller in Play 2.6

问题描述

尝试在Scala的Play 2.6中测试控制器时，出现了空指针异常. 这是对OK响应的测试:

I'm getting a null pointer exception when trying to test a controller in Play 2.6 in Scala. This is a test for an OK response:

class ApplicationControllerSpec extends PlaySpec
with MockitoSugar with ScalaFutures {

  val mockOrchestrator = mock[ApplicationOrchestrator]
  val mockCC = mock[ControllerComponents]
  val controller = new ApplicationController(mockOrchestrator, mockCC)
  val method = controller.home()(FakeRequest())

  assert(status(method) == 200)
}

这是我正在测试的控制器:

This is the Controller I'm testing:

class ApplicationController @Inject()
(orchestrator: ApplicationOrchestrator, cc: ControllerComponents)
extends AbstractController(cc) with I18nSupport {

    def home(): Action[AnyContent] = Action {
      implicit request: RequestHeader => //line 29
        Ok(views.html.home())
    }
}

该错误似乎与隐式请求相关，但我找不到解决方案.

The error looks like it is associated with the implicit request but I cannot find a solution.

日志输出为:

java.lang.NullPointerException was thrown. java.lang.NullPointerException at controllers.ApplicationController.home(ApplicationController.scala:29)

java.lang.NullPointerException was thrown. java.lang.NullPointerException at controllers.ApplicationController.home(ApplicationController.scala:29)

推荐答案

NPE是因为您正在使用mock[ControllerComponents].只需将其替换为stubControllerComponents()，一切都会按预期进行.

NPE is because you are using mock[ControllerComponents]. Just replace it with stubControllerComponents() and things will work as expected.

当您调用未正确模拟的方法或访问字段时，在测试中会发生NPE.

NPE occurs in testing when you call methods or access fields which are not mocked properly.

我想你错过了读这篇文章. https://www.playframework.com/documentation/2.6.x/Highlights26# StubControllerComponents

I guess you missed reading this. https://www.playframework.com/documentation/2.6.x/Highlights26#StubControllerComponents

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