Mocking signals for unit/widget testing

[biscottis]

Hi! I think signals is a criminally underrated state management framework, love it so far. It's a lightweight version of MobX, GetX without codegen and feels performant so far.

I have a question, how can I mock signals for widget testing? If that makes any sense.

I want to test screens or widgets given a certain 'state', for example in classic Bloc/Cubit you would have https://pub.dev/packages/bloc_test.

[rodydavis]

In my tests I do a couple different things. If it is global I update the value in tests or override if the global is late or final.

I also can define signals in classes and pass them in via DI.

For testing it's just like other unit and widget tests.

There is a draft PR for possibly using checks for this too:

#104

I think the question might imply more of a tracked signal in tests like testing the stream values and I think that would be possible with a signals observer

[jinyus]

@biscottis I just added testing with mocks for the shopping cart example. It uses the DI approach mentioned by @rodydavis

#110

[rodydavis]

Moving to a discussion, there are many approaches that can be done to test signals and excited to see what the community does!