Espresso - How can I check if an activity is launched after performing a certain action?

Question

the following is one of my Espresso test cases.

    public void testLoginAttempt() {
        Espresso.onView(ViewMatchers.withId(R.id.username)).perform(View         


        

Answer 1

Try with

intended(hasComponent(new ComponentName(getTargetContext(), ExpectedActivity.class)));

Look at response from @riwnodennyk

Answer 2

The problem is that your application performs the network operation after you click login button. Espresso doesn't handle (wait) network calls to finish by default. You have to implement your custom IdlingResource which will block the Espresso from proceeding with tests until IdlingResource returns back in Idle state, which means that network request is finished. Take a look at Espresso samples page - https://google.github.io/android-testing-support-library/samples/index.html

Answer 3

You can use:

intended(hasComponent(YourExpectedActivity.class.getName()));

Requires this gradle entry:

androidTestCompile ("com.android.support.test.espresso:espresso-intents:$espressoVersion")

The import for the intended() and hasComponent()

import static android.support.test.espresso.intent.Intents.intended;
import static android.support.test.espresso.intent.matcher.IntentMatchers.hasComponent;

as mentioned by Shubam Gupta please remember to call Intents.init() before calling intended(). You can eventually call it in the @Before method.

Answer 4

Try:

intended(hasComponent(YourActivity.class.getName()));

Also, keep in mind

java.lang.NullPointerException is thrown if Intents.init() is not called before intended()

Answer 5

@RunWith(RobolectricTestRunner.class)
public class WelcomeActivityTest {

    @Test
    public void clickingLogin_shouldStartLoginActivity() {
        WelcomeActivity activity = Robolectric.setupActivity(WelcomeActivity.class);
        activity.findViewById(R.id.login).performClick();

        Intent expectedIntent = new Intent(activity, LoginActivity.class);
        assertThat(shadowOf(activity).getNextStartedActivity()).isEqualTo(expectedIntent);
    }
}

Answer 6

I use this approach:

// The IntentsTestRule class initializes Espresso Intents before each test, terminates the host activity, and releases Espresso Intents after each test
    @get:Rule
    var tradersActivity: IntentsTestRule<TradersActivity> = IntentsTestRule(TradersActivity::class.java)
    @get:Rule
    var jsonViewActivity: IntentsTestRule<JsonViewActivity> = IntentsTestRule(JsonViewActivity::class.java)

    @Test
    fun scrollToItemAndClick() {
     onView(withId(R.id.tradersRecyclerView)).perform(RecyclerViewActions.actionOnItemAtPosition<RecyclerView.ViewHolder>(ITEM_POS, click()))

        // check is activity was started
        intended(hasComponent(JsonViewActivity::class.java.getName()))
    }