Can something like Rule be used in kotest I need to set the kotlinlang #kotest

@ExperimentalCoroutinesApi
class MainCoroutineRule(
    val testDispatcher: TestCoroutineDispatcher = TestCoroutineDispatcher()
) : TestWatcher() {

    override fun starting(description: Description?) {
        super.starting(description)
        Dispatchers.setMain(testDispatcher)
    }

    override fun finished(description: Description?) {
        super.finished(description)
        Dispatchers.resetMain()
        testDispatcher.cleanupTestCoroutines()
    }
}

I am trying to apply kotest to Android.

sam

01/21/2021, 5:40 AM

In kotest, all tests are coroutines, so you can just use withContext and set any dispatcher you want

test("my test") {
  withContext(TestCoroutineDispatcher()) {
    ...
  }
}

or if that doesn't work (I'm not sure what Dispatchers.setMain is), you could write a listener to do that easily

class MainCoroutineListener(
    val testDispatcher: TestCoroutineDispatcher = TestCoroutineDispatcher()
) : TestListener() {

    override fun beforeTest(description: Description?) {
        Dispatchers.setMain(testDispatcher)
    }

    override fun afterTest(description: Description?) {
        Dispatchers.resetMain()
        testDispatcher.cleanupTestCoroutines()
    }
}

https://kotest.io/docs/framework/listeners.html

Luis Daivid

01/21/2021, 5:43 AM

Is this how to create a new testListener?

Is it possible to create a custom listener?

Oh I see.

class MyTestClass : FunSpec({ listeners(TimerListener) // tests here })

class MyTestClass : FunSpec({ listeners(MainCoroutineListener) // tests here })

sam

01/21/2021, 5:44 AM

yes

exactly

or if you want to register them at the global level, you can use project config

Luis Daivid

01/21/2021, 5:44 AM

Thank you. You are really kind.

sam

01/21/2021, 5:45 AM

https://kotest.io/docs/framework/project-config.html

Luis Daivid

01/21/2021, 5:46 AM

Thank you. It was very helpful.

👍🏻 1

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