How To/should I Unit Test Eventbus Events With Mockito?

I use Otto's EventBus in my Android app. In my LoginNetworkOperation class, I catch different kinds of network connection errors and I post different bus events for each one, and m

Solution 1:

My question is how (and should I) do I unit test whether the LoginNetworkOperation throws this event and LoginPresenter handles it with Mockito?

That's already an integration test: you're combining individual software modules and verifying their behaviour as a group.

In that case the "subject under test" is the combination of LoginNetworkOperation, EventBus and LoginPresenter and the mocked objects are the inputs to LoginNetworkOperation and whatever handles the output of LoginPresenter.

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Those three software modules can also be unit tested:

• LoginNetworkOperation.execute: mock the EventBus and verify that it's called with the correct ExceptionEvent for different inputs.
• LoginPresenter.onExceptionEvent: verify correct behaviour for different ExceptionEvents.
• EventBus.post: register a mocked ExceptionEvent-Handler, post an ExceptionEvent and check that the Handler is called.