class MainViewModelTest {
  
    @ExperimentalCoroutinesApi
    private val testDispatcher = TestCoroutineDispatcher()
  
    @Before
    fun setup() {
        // 1
        Dispatchers.setMain(testDispatcher)
    }

    @After
    fun tearDown() {
        // 2
        Dispatchers.resetMain()
        // 3
        testDispatcher.cleanupTestCoroutines()
    }

@JvmField
@RegisterExtension
val coroutineTestExtension = CoroutineTestExtension()

@BeforeEach
fun setup() {
   myObjectIWantToTest = MyObject(coroutineTestExtension.testDispatcher)
}

class SupervisedCoroutineScopeBehavior(
        private val baseContext: CoroutineContext
) : SupervisedCoroutineScope {

    override val coroutineContext: CoroutineContext
        get() = baseContext + supervisingJob

    private val supervisingJob = SupervisorJob()

    override fun cancelSupervisedJob() {
        supervisingJob.cancel()
    }

    override fun cancelCoroutines() {

        supervisingJob.cancelChildren()
    }