如何在片段中测试 Toast

Question

如何创建确认 Toast 显示在片段中的测试。

这是我测试的骨骼

@RunWith(AndroidJUnit4:class)
class MyFragmentTest() {

    val displayToast = R.id.btn_toast

    @Before()
    fun setup() {
        launchFragmentInContainer<MyFragment>(null, R.style.My_Theme)
    }

    @Test
    fun displayToast() {
        onView(withId(displayToast).perform(click())
        // Insert different ideas here to display toast. 
    }
}

想法一[=43=]

onView(WithText("My Toast").check(matches(isDispalyed)))

错误

androidx.test.espresso.NoMatchingViewException: No views in hierarchy found matching: with string from resource id: <2131755008>[Toast_no_word] value: No word entered

想法二这个例子需要一个自定义的 ToastMatcher，

onToast("My Toast").check(matches(isDisplayed()))

错误

androidx.test.espresso.NoMatchingViewException: No views in hierarchy found matching: with text: is "No word entered"

思路三此选项还使用自定义 ToastMatcher，我已经为 kotlin 更新了它。

Coding with Mitch, youtube tutorial

Coding with Mitch Github

onView(withText("My Toast")).inRoot(TOastMatcher()).check(matches(isDisplayed()))

Returns下面的错误

androidx.test.espresso.NoMatchingRootException: Matcher 'is toast' did not match any of the following roots: [Root{application-window-token=android.view.ViewRootImpl$W@6b8a33b, window-e

我已经坚持了一段时间，如果您有其他建议或对我哪里出错的想法，我会很感激。

Answer 1

使用 RobolectricTestRunner 在测试中启动片段 Activity。要启动片段，请在 @Before 函数中创建一个 FragmentScenario。在 @Test 中使用 ShadowToast 来测试吐司。

@RunWith(RobolecticTestRunner::class)
class MyFragmentUnitTest {

    private lateinit var scenario: FragmentScenario<MyFragment>

    @Before
    fun setup() {

        val viewModel: MyViewModel = mock(MyViewModel::class.java)

        // Your scenario may not need to include all this information. 
        scenario = launchFragmentInContainer(
            factory = MyFragmentFactory(viewModel),
            fragmentArgs = null,
            themeResId = R.style.Theme_mine
        )
    }

    @Test
    fun `show toast`() {
        // Reference the button that will display the toast. 
        val toastButton = onView(ViewMatchers.withId(R.id.button_toast))
        
        // perform a click on the button
        toastButton.perform(ViewActionsclick())

        val toastText = "This is my toast"
        assertEquals(ShadowToast.shoedToast(toastText))
    }
}

如何在片段中测试 Toast

How to test a Toast in a fragment

android

android-fragments

kotlin

android-testing