Testing activity in a custom application

Question

I have a custom application called MainApplication. The activity I am testing references the application context. The code looks like this:

@Override
protected void onCreate(final Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    mAppContext = (MainApplication) getApplicationContext();

    ....

}

I am using RoboGuice 2.0 and Robolectric 2.2. Now whenever I test the activity, like

@RunWith(RobolectricTestRunner.class)
public class DetailActivityTests {
    protected MainApplication application = mock(MainApplication.class, RETURNS_DEEP_STUBS);
    protected Context context = mock(RoboActivity.class, RETURNS_DEEP_STUBS);

    @Before
    public void setup() {
        when(context.getApplicationContext()).thenReturn(application);
        when(application.getApplicationContext()).thenReturn(application);
    }

    @Test
    public void testActivity() {
        Activity activity = Robolectric.buildActivity(DetailActivity.class).create().get();
        ....
    }
}

I get an the casting issue:

 android.app.Application cannot be cast to com.xxx.xxx.xxx.MainApplication
    [junit] java.lang.ClassCastException: android.app.Application cannot be cast to com.xxx.xxx.xxx.MainApplication
    [junit]     at com.xxx.xxx.xxx.activity.DetailActivity.onCreate(DetailActivity.java:52)
    [junit]     at android.app.Activity.performCreate(Activity.java:5008)
    [junit]     at org.fest.reflect.method.Invoker.invoke(Invoker.java:112)
    [junit]     at org.robolectric.util.ActivityController$1.run(ActivityController.java:116)
    [junit]     at org.robolectric.shadows.ShadowLooper.runPaused(ShadowLooper.java:256)
    [junit]     at org.robolectric.util.ActivityController.create(ActivityController.java:111)
    [junit]     at org.robolectric.util.ActivityController.create(ActivityController.java:123)
    [junit]     at com.xxx.xxx.xxx.activity.GlanceActivityTests.testActivity(DetailActivityTests.java:33)
    [junit]     at org.robolectric.RobolectricTestRunner$2.evaluate(RobolectricTestRunner.java:234)
    [junit]     at org.robolectric.RobolectricTestRunner$1.evaluate(RobolectricTestRunner.java:175)

How can i fix this?

I'm setting the application used in test to my main application using `setApplication()` — Ahmed Zayed, Mar 03 '14 at 18:08
@AhmedHafez Could you be more specific about `setApplication()`? Thanks! — Grace Huang, Mar 03 '14 at 18:20
if (getApplication() == null || getApplication() instanceof MockApplication) { MyApplication myApp = new MyApplication(); setApplication(myApp); myApp.loadForTesting(getSystemContext()); } — Ahmed Zayed, Mar 03 '14 at 18:23
In your service setup, this will run this test under your application — Ahmed Zayed, Mar 03 '14 at 18:39
Hmmm, I'm still not sure I understand it. If you could give a more specific instruction, I would appreciate it a lot. — Grace Huang, Mar 03 '14 at 19:10
As i understand, your problem is concerning to disability to cast the application class that is running the test case to your custom application instance. So, i solved this bug by setting the testing application to my application instance. You can set the running test application to your custom application using the above code. — Ahmed Zayed, Mar 03 '14 at 19:26
I searched around and I dont think setApplication is part of Robolectric 2.0 now. — Grace Huang, Mar 03 '14 at 19:45
Sorry for your corruption. but i was not using Robolectric and yes no set application in Robolectric. — Ahmed Zayed, Mar 03 '14 at 19:52

Testing activity in a custom application

0 Answers0