Android用例和存储库单元测试

我在单元测试用例时遇到问题。下面是用例代码-

    interface MyUseCase {
        fun performCustomAction(action: MyAction): LiveData<Result>
    }

    class MyUseCaseImpl(private val dataRepository: DataRepository) : MyUseCase {

       override fun performCustomAction(action: MyAction) = liveData {
          emit(Result.DataFetchInProgress)
          emit(dataRepository.performDataOperation(action))
       }
    }

我在这里犯了什么错误

---

另外，您能建议我在我的用例中还可以测试什么吗？

我修复了它。基本上我需要添加一个Mockito。当…然后返回livedata。 下面是代码-

@Test
fun myUseCase_loginUser_expectedUserLoggedIn() {
    `when`(
        myUseCase.performCustomAction(
          MyAction.LoginUser(
            "userName", "password"
          )
        )
    ).thenReturn(liveData)

    val result = myUseCase.performCustomAction(
        MyAction.LoginUser(
            "userName", "password"
        )
    )

    Assert.assertThat(result, `is`(liveData))
}

java.lang.AssertionError: 
Expected :androidx.lifecycle.CoroutineLiveData@4c012563
Actual   :liveData

@Test
fun myUseCase_loginUser_expectedUserLoggedIn() {
    `when`(
        myUseCase.performCustomAction(
          MyAction.LoginUser(
            "userName", "password"
          )
        )
    ).thenReturn(liveData)

    val result = myUseCase.performCustomAction(
        MyAction.LoginUser(
            "userName", "password"
        )
    )

    Assert.assertThat(result, `is`(liveData))
}