Testing that button starts an Activity with Robolectric

Question

Hi I have the following code:

@RunWith(Test9Runner.class) public class MainActivityTest  {     private MainActivity activity;     private Button pressMeButton;      @Before     public void setUp() throws Exception      {         activity = new MainActivity();         activity.onCreate(null);         pressMeButton = (Button) activity.findViewById(R.id.button1);     }      @Test     public void shouldUpdateResultsWhenButtonIsClicked() throws Exception      {         pressMeButton.performClick();         ShadowActivity shadowActivity = shadowOf(activity);         Intent intent = shadowActivity.getResultIntent();         System.out.print(intent.toString());     } } 

But I have no idea how to test that pressing pressMeButton started a new Activity. Actually it does, but how to write the correct Robolectric unit test for this fact?

Answer 1

In Robolectric 2.1.1 you can verify if Intent starting new Activity was emitted in following way.

@RunWith(RobolectricTestRunner.class) public class MyTest {   private ShadowActivity shadowActivity;   private MyActivity activity;    @Before   public void setup() {     activity = new MyActivity();     shadowActivity = Robolectric.shadowOf(activity);           }    @Test   public shouldStartNewActivityWhenSomething() {     //Perform activity startup     //Do some action which starts second activity, for example View::performClick()     //...     //Check Intent     Intent intent = shadowActivity.peekNextStartedActivityForResult().intent;     assertThat(intent.getStringExtra(MySecondActivity.EXTRA_MESSAGE)).isEqualTo("blebleble");     assertThat(intent.getComponent()).isEqualTo(new ComponentName(activity, MySecondActivity.class));   } } 

This is similar to what I am doing. Please note that creating Activity by calling new Activity() will make Robolectric print warnings about creating activity improperly, this probably can be done better...