I am going to test fragment with Espresso then i want to mock viewmodels and members.

在我的 viewModel 我有一个 void function 像这样:

In my viewModel i have a void function like this :

fun getLoginConfig() {
    viewModelScope.launchApiWith(_loginConfigLiveData) {
       repository.getLoginConfig()
    }
}

在测试 fragment 当我们从 viewModel 调用 getLoginConfig() 我想用 mock>doNothing() 但我面临这个错误:

In test fragment when we call getLoginConfig() from viewModel i want to mock it with doNothing() but i faced with this error :

org.mockito.exceptions.misusing.UnfinishedStubbingException: 
Unfinished stubbing detected here


E.g. thenReturn() may be missing.
Examples of correct stubbing:
    when(mock.isOk()).thenReturn(true);
    when(mock.isOk()).thenThrow(exception);
    doThrow(exception).when(mock).someVoidMethod();
Hints:
 1. missing thenReturn()
 2. you are trying to stub a final method, which is not supported
 3. you are stubbing the behaviour of another mock inside before 'thenReturn' instruction is completed

在 testFragmentClass 的这一行:

   @Before
    fun setUp() {
        //logOut


        mockVm = mock(SplashVM::class.java)

        loadKoinModules(module {
            single {
                mockVm
            }
        })
}




   doNothing().`when`(mockVm.getLoginConfig()).let {
       mockVm.loginConfigLiveData.postValue(Resource.Success(
           LoginConfigResponse(
               listOf("1"),1,1,"1",true)
       ))
   }

推荐答案

一些事情:

• doNothing 什么都不做，这对于 mock 上的 void 方法来说是不必要的.这是默认行为.您只希望 doNothing 用于间谍或已存根的模拟.
• 如果您希望在响应模拟调用时发生特定的事情，doAnswer 就是这样去.
• 在 doVerb 语法中，Mockito 期望那里只有一个变量；表达式不应调用 mock 上的方法，否则 Mockito 会认为您已经失去兴趣并抛出 UnfinishedStubbingException.

• doNothing just does nothing, which is unnecessary for void methods on a mock. It's the default behavior. You only want doNothing for spies or already-stubbed mocks.
• If you want something specific to happen in response to a call on a mock, doAnswer is the way to go.
• In doVerb syntax, Mockito expects that there is only a variable there; the expression should not call a method on a mock, or else Mockito thinks you've lost interest and throws UnfinishedStubbingException.

因此你的修复看起来像:

Therefore your fix looks like:

doAnswer {
  mockVm.loginConfigLiveData.postValue(Resource.Success(
    LoginConfigResponse(
      listOf("1"),1,1,"1",true)
  ))
}.`when`(mockVm).getLoginConfig()

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