A test rule to allow testing coroutines with ease. It provides you a `scope: TestCoroutineScope` and `dispatcher: TestCoroutineDispatcher` ready to be used.

CoroutineRule.kt

import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.test.TestCoroutineDispatcher
import kotlinx.coroutines.test.TestCoroutineScope
import kotlinx.coroutines.test.resetMain
import kotlinx.coroutines.test.setMain
import org.junit.rules.TestWatcher
import org.junit.runner.Description

@Suppress("MemberVisibilityCanBePrivate")
class CoroutineRule(
    val dispatcher: TestCoroutineDispatcher = TestCoroutineDispatcher(),
    val scope: TestCoroutineScope = TestCoroutineScope(dispatcher),
) : TestWatcher() {

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

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