Hello everyone! RX has `testScheduler` and it has...

# android

[Vladislav Shipugin]

Hello everyone!

RX has testScheduler and it has triggerActions(). Is there any analogue in coroutines?

I’m looking for an analogue in runBlockingTest, but this has an experimental API.

[Olivier Patry]

Maybe TestCoroutineDispatcher is what you are looking for?
see https://developer.android.com/kotlin/coroutines/coroutines-best-practices#test-coroutine-dispatcher

[Olivier Patry]

(I might be wrong, I don't know RX, but I assume it's the same)

[Vladislav Shipugin]

Yes and no) It’s also in ExperimentalCoroutinesApi.

[Olivier Patry]

I also used Dispatchers.Unconfined to execute coroutines sequentially, removing asynchronicity

[Olivier Patry]

it makes tests more reliable (hiding some concurrent access bugs though… but covered in integration tests)

[Olivier Patry]

it's less powerful though and doesn't answer all use cases (like pausing, resuming, moving forward in time…)

[Vladislav Shipugin]

Thank! I need to pause the coroutine, check the state at loading, and then continue.

[Vladislav Shipugin]

I found answer in this article: https://medium.com/androiddevelopers/testing-two-consecutive-livedata-emissions-in-coroutines-5680b693cbf8