CODEWITHSUNDEEP
androidmockitojunit4android-espressoandroid-junit
Jemo Mgebrishvili
Jemo Mgebrishvili

Reputation: 5487

how to test fragment navigations which is handled by the Activity

I want to test fragment navigations, which is handled by the MainActivity.

for that I have created HomeFragmentTest class

@MediumTest
@RunWith(AndroidJUnit4::class)
class HomeFragmenTest {

  @Rule
  @JvmField
  val mockitoRule: MockitoRule = MockitoJUnit.rule()

  @Test
  fun onUsersButtonClick_navigateUsersListFragmet() {
    val navController = mock(NavController::class.java)

    val fragScenario = launchFragmentInContainer<UsersListFragment>()

    fragScenario.onFragment {
        Navigation.setViewNavController(it.requireView(), navController)
    }

    onView(withId(R.id.usersButton))
      .perform(click())

    verify(navController).navigate(R.id.usersListFragment)
  }
  
}

running the test invokes button click action and then viewModel invokes navigate method which will post event to the MainActivity. MainActivity observes this event and calls navController navigate method

viewModel.navAction.observe(this, { direction ->
   navController?.navigate(direction)
})

The problem is that my test is failing

Wanted but not invoked:
navController.navigate(2131296591);
Actually, there were zero interactions with this mock.

Upvotes: 0

Views: 143

Answers (0)

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