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我正在尝试在我的 RecyclerView 上运行单元测试。对于我的第一个测试,我想看看是否显示了 RecyclerView。

@RunWith(RobolectricTestRunner::class)
class WordListFragmentTest {

    // Executes task sin the Architecture component in the same thread.
    @get:Rule
    var instantTaskExecutorRule = InstantTaskExecutorRule()
    
    private lateinit var scenario: FragmentScenario<WordListFragment>

    private lateinit var viewModel: MainViewModel
    
    val word = Word("Word")
    
    @Before
    fun setup() {
        viewModel = mock(MainViewModel::class.java)


        scenario = launchFragment(
            factory = MainFragmentFactory(viewModel),
            fragmentArgs = null,
            themeResId = R.style.Theme_Words,
            initialState = Lifecycle.State.RESUMED
        )

    }

    @Test
    fun `recyclerView displayed`() {
        onView(withId(R.id.recyclerView))
            .check(matches(isDisplayed()))
    }

运行测试后,我收到以下错误。

java.lang.Exception: Main looper has queued unexecuted runnables. This might be the cause of the test failure. You might need a shadowOf(getMainLooper()).idle() call.

这似乎与在片段中提交列表的 LiveData 观察者有关。如果我注释掉提交功能,测试将运行。

片段。

class WordListFragment(private val viewModel: MainViewModel) : Fragment() {

    ...

    private fun submitList() {
        viewModel.wordList.observe(viewLifecycleOwner, {
            it?.let {
                rvAdapter.submitList(it)
            }
        })
    }
}

面视图模型

class MainViewModel @Inject constructor(
    var repository: IWordRepository,
    @IoDispatcher var ioDispatcher: CoroutineDispatcher
) : ViewModel() {
    
    var wordList: LiveData<List<Word>> = repository.allWords
    ...
}

此链接表明 Robolectric 将默认为 LooperMode.LEGACY 行为,但这可以通过将 @LooperMode(NewMode) 注释应用于测试包、测试类或测试方法或通过“robolectric.looperMode”系统属性来覆盖。运行测试时,我仍然遇到同样的错误。

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0 回答 0