How to test for the appearance of a Toast message

Question

Would anyone know how to test for the appearance of a Toast message on an Activity?

I\'m using code similar to what the OP posted on this question for testing my pro

Answer 1

For those now using the AndroidX Test API in 2019 and using a custom layout for toasts, try this (Kotlin):

@RunWith(AndroidJUnit4:class)
class ActivityUnitTest {
    private lateinit var scenario: ActivityScenario

    @Before fun setUp() {
        scenario = ActivityScenario.launch(MainActivity::class.java)
    }

    @Test fun shouldDisplayToastErrorMessageIfSearchFieldIsEmpty() {
        scenario.onActivity { activity ->
            activity.id_of_button.performClick()
            assertThat(
                ShadowToast.getLatestToast().view.id_of_textview.text.toString(),
                equalTo("Text to be tested")
            )
        }
    }
}