我在为ViewModel传递Coroutine UnitTestcase时遇到问题。我正在使用MVVM改造。
尽管我 mock 了该结果，但其显示结果为“null”
请在下面的UnitTest案例类中找到:
val testDispatcher = TestCoroutineDispatcher()
@Test
fun `check viewmodel fetches data correctly`() = testDispatcher.runBlockingTest{
var retroRxModel = RetroRxModel("tile", "body", "1")
var retroRXModelList = ArrayList<RetroRxModel>()
retroRXModelList.add(retroRxModel)
response = Response.success(retroRXModelList)
retroCoroutineViewModel = RetroCoroutineViewModel(testDispatcher)
if (retrofit != null) {
if (apiService != null) {
Mockito.`when`(apiService.fetchUserPosts()).thenReturn(response)
}
}
retroCoroutineViewModel.fetchResponseFromAPI()
println("Loading Val::::${retroCoroutineViewModel.fetchLoadStatus()?.value}")
println("PostLive Dat::::${retroCoroutineViewModel.fetchPostLiveData().value}")
Assert.assertEquals(true,retroCoroutineViewModel.loading?.value)
}
请找到要测试的viewmodel方法:
fun fetchResponseFromAPI(){
viewModelScope.launch (dispatcher){
// postsMutableLiveData.postValue(null)
try{
val response = apiService.fetchUserPosts()
if(response.isSuccessful){
postsMutableLiveData.postValue(response.body())
loading.postValue(false)
// loading.value = false
}else{
loading.postValue(false)
errorOnAPI.postValue("Something went wrong::${response.message()}")
}
}catch (e:Exception){
loading.postValue(false)
errorOnAPI.postValue("Something went wrong::${e.localizedMessage}")
}
}
}
ViewModelFactory:
class RetroCoroutineViewModelFactory : ViewModelProvider.Factory {
@ExperimentalStdlibApi
override fun <T : ViewModel?> create(modelClass: Class<T>): T {
if (modelClass.isAssignableFrom(RetroCoroutineViewModel::class.java)) {
return RetroCoroutineViewModel(Dispatchers.Main) as T
}
throw IllegalArgumentException("Unknown ViewModel class")
}
}
尝试运行unittest时，我看到在ViewModel中执行以下行后，尽管模拟了数据，但未运行其他代码，但返回了控件:
val response = apiService.fetchUserPosts()
请帮我解决这个问题。我正在使用Mockito框架
最佳答案
因为retroCoroutineViewModel没有使用模拟的apiService实例。
正在创建viewmodel对象并且正在模拟apiService(考虑是否正在执行ifs)，但是apiService对象中的retroCoroutineViewModel对象与模拟实例不同，因此您需要确保retroCoroutineViewModel对象具有模拟的apiService对象。您的服务(通过构造函数将apiService传递给RetroCoroutineViewModel吗？)