验证rxjava用户互动 [英] Verify interactions in rxjava subscribers

问题描述

照片中的MVP模式的情况下你的presenter订阅返回一个观察者服务：

Picture the situation in an MVP pattern where your presenter subscribes to a service returning an observer:

public void gatherData(){
   service.doSomeMagic()
      .observeOn(Schedulers.io())
      .subscribeOn(AndroidSchedulers.mainThread())
      .subscribe(new TheSubscriber());
}

现在的类 TheSubscriber 通话 onNext 从视图的方法，说：

Now the class TheSubscriber calls onNext a method from the view, say:

@Override public void onNext(ReturnValue value) {
  view.displayWhatever(value);
}

现在，在我的单元测试，我想验证方法时 gatherData（）被称为一个非错误的情况下，该视图的方法 displayWhatever（值）被调用。

Now, in my unit test I would like to verify that when the method gatherData() is called on a non-erroneous situation, the view's method displayWhatever(value) is called.

问题

有没有干净的方式做到这一点？

Is there a clean way to do this?

背景

• 我使用到的Mockito验证的互动和更大量的课程


• 匕首被注入整个presenter除了 TheSubscriber

• I'm using mockito to verify the interactions and a lot more of course
• Dagger is injecting the entire presenter except for TheSubscriber

有什么我试过

• 注入的用户，并在测试中嘲笑它。看起来有点脏了我，因为如果我想改变presenter与服务交互（说不RX）的方式，然后我需要改变大量的测试和code。


• 莫克整个服务。这不是那么糟糕，但要求我嘲笑了很多方法，我并没有完全达到我想要的东西。


• 抬头一看周围的互联网，但似乎没有人有这样
干净笔直的路

• Inject the subscriber and mock it in the tests. Looks a bit dirty to me, because if I want to change the way the presenter interacts with the service (Say not Rx) then I need to change a lot of tests and code.
• Mock the entire service. This was not so bad, but requires me to mock a lot of methods and I didn't quite reach what I wanted.
• Looked up around the internet, but no one seems to have a clean straight way of doing this

感谢您的帮助。

推荐答案

假设你正在使用接口服务和视图以类似的方式：

Assuming that you are using interfaces for service and view in a similar manner:

class Presenter{
  Service service;
  View view;

  Presenter(Service service){
    this.service = service;
  }

  void bindView(View view){
    this.view = view;
  }

  void gatherData(){
    service.doSomeMagic()
      .observeOn(Schedulers.io())
      .subscribeOn(AndroidSchedulers.mainThread())
      .subscribe(view::displayValue);
  }
}

有可能再提供模拟控制和验证的行为：

It is possible then to provide mock to control and verify behaviour:

@Test void assert_that_displayValue_is_called(){
  Service service = mock(Service.class);
  View view = mock(View.class);
  when(service.doSomeMagic()).thenReturn(Observable.just("myvalue"));
  Presenter presenter = new Presenter(service);
  presenter.bindView(view);

  presenter.gatherData();

  verify(view).displayValue("myvalue");
}

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