未使用ViewModel和LiveData模拟的UnitTest方法

Question

我想为ViewModel与存储库的交互编写一个测试：

class ExampleUnitTest: KoinComponent {
val repository : Repository = mock()
val application : Application = mock()
val userRepository : UserRepository = mock()
private  var tasksViewModel =  MyModel(repository,application,userRepository)

// A CoroutineContext that can be controlled from tests
private val testContext = TestCoroutineContext()

// Set the main coroutines dispatcher for unit testing.
@ExperimentalCoroutinesApi
@get:Rule
var coroutinesMainDispatcherRule = ViewModelScopeMainDispatcherRule(testContext)

// Executes each task synchronously using Architecture Components.
@Rule
@JvmField
var instantTaskExecutorRule = InstantTaskExecutorRule()
@Test
fun addition_isCorrect() {
    tasksViewModel.deleteAll()
    verify(repository).deleteAll()

 }
}

我的ViewModel包含LiveData：

 class MyModel(var repository: Repository, application: Application, val userRepository: UserRepository) :
    val items = MutableLiveData<List<LiveData<Task>>>().apply {
    value = emptyList()
 }
}

运行测试时，出现以下错误：

java.lang.RuntimeException: Method getMainLooper in android.os.Looper not mocked.

和对

的引用

value = emptyList() 

在我的ViewModel里面

我删除此行时

value = emptyList()

它运作良好，但是如何处理而不删除此行