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

在我的 viewModel 我有一個 void function 像這樣:

In my viewModel i have a void function like this :

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

在測試 fragment 當我們從 viewModel 調用 getLoginConfig() 我想用 mock>doNothing() 但我面臨這個錯誤:

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 的這一行:

   @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)
       ))
   }

推薦答案

一些事情:

• doNothing 什么都不做，這對于 mock 上的 void 方法來說是不必要的.這是默認行為.您只希望 doNothing 用于間諜或已存根的模擬.
• 如果您希望在響應模擬調用時發生特定的事情，doAnswer 就是這樣去.
• 在 doVerb 語法中，Mockito 期望那里只有一個變量；表達式不應調用 mock 上的方法，否則 Mockito 會認為您已經失去興趣并拋出 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.

因此你的修復看起來像:

Therefore your fix looks like:

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

這篇關于當我想模擬數據并測試 UI 片段時，doNothing() 不起作用的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！