Android - Espresso test with pressBack

Question

I am trying to test my application with the Espresso framework. It should be tested whether the application is exited when pressing back in the main activity and whether the main application is displayed when calling another activity from the main activity and then pressing back.

public class MainActivityTest {
    @Rule
    public IntentsTestRule<MainActivity> intentsTestRule = new IntentsTestRule<>(
            MainActivity.class
    );

    @Test
    public void test_pressBack() {
        try {
            pressBack();
            fail();
        } catch (NoActivityResumedException exc) {
            // test successful
        }
    }

    @Test
    public void test_anotherActivity_pressBack() {
        onView(withId(R.id.button1)).perform(click());
        pressBack();
        intended(hasComponent(new ComponentName(getTargetContext(), MainActivity.class)));
    }
}

For the first scenario (exit app), I am catching NoActivityResumedException , but this does not seem like the right way to do this.

For the second scenario (return to main activity), I get an intent error:

android.support.test.espresso.base.DefaultFailureHandler$AssertionFailedWithCauseError: Wanted to match 1 intents. Actually matched 0 intents.

IntentMatcher: has component: has component with: class name: is "myPackage.MainActivity" package name: an instance of java.lang.String short class name: an instance of java.lang.String

Matched intents:[]

Recorded intents:
-Intent { cmp=myPackage/.AnotherActivity} handling packages:[[myPackage]])

Answer 1

Regarding 1st test - you may use

Espresso.pressBackUnconditionally()

that is not throwing NoActivityResumedException exception. Afterwards check if your activity is running/in foreground.

Regarding 2nd test:

intended(hasComponent(MainActivity::class.qualifiedName))

works for me (code in Kotlin). So, basically using hasComponent(String className) instead of hasComponent(ComponentName componentName)