Issue
How do you create a Test that confirms a Toast is displayed in a fragment.
Here are the bones of my test
@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.
}
}
- Idea one
onView(WithText("My Toast").check(matches(isDispalyed)))
Error
androidx.test.espresso.NoMatchingViewException: No views in hierarchy found matching: with string from resource id: <2131755008>[Toast_no_word] value: No word entered
- Idea 2 This example requires a custom ToastMatcher, ToastMatcher
onToast("My Toast").check(matches(isDisplayed()))
error
androidx.test.espresso.NoMatchingViewException: No views in hierarchy found matching: with text: is "No word entered"
- Idea three This option also uses custom ToastMatcher, I've updated it for kotlin.
https://stackoverflow.com/a/42061993/3943340 Coding with Mitch, youtube tutorial
onView(withText("My Toast")).inRoot(TOastMatcher()).check(matches(isDisplayed()))
Returns the following error
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
I've been stuck on this for a while if you have an alternative suggestion or an idea of where I've gone wrong it would be apprecaited.
Solution
Use the RobolectricTestRunner to launch a fragment in a test Activity. To launch the fragment create a FragmentScenario in a @Before function. In a @Test fun use ShadowToast to test the toast.
@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))
}
}
Answered By - Shawn
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