Boiler plate code to make threading work on the coroutines in the mockK

Add the below lines in each of the test class

@ExperimentalCoroutinesApi
@get:Rule
val coroutineTestRule = CoroutinesTestRule()

@get:Rule
val instantTaskExecutorRule = InstantTaskExecutorRule()

Define the below class

/**
 * Sets the main coroutines dispatcher for unit testing.
 *
 * See https://medium.com/androiddevelopers/easy-coroutines-in-android-viewmodelscope-25bffb605471
 * and https://github.com/Kotlin/kotlinx.coroutines/tree/master/kotlinx-coroutines-test
 */
@ExperimentalCoroutinesApi
class CoroutinesTestRule(
    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()
    }
}