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How can I shadow the PackageManager with Robolectric

My Android application has a simple method to fire off an intent to display a URL.

protected void launchBrowser(int id)
{
    Uri uri = Uri.parse( getString( id ) );
    Intent intent = new Intent( ACTION_VIEW, uri);

    PackageManager packageManager = getPackageManager();
    List<ResolveInfo> activities = packageManager.queryIntentActivities(intent, 0);
    if (activities.size() > 0)
    {
        startActivity(intent);
    }
    else
    {
        Toast.makeText(getApplicationContext(),
                       "ERROR - no application to display a web page",
                       Toast.LENGTH_SHORT).show();
    }
}

I'm using Robolectric for unit testing but I'm having trouble verifying this method. Specifically, getPackageManager() is always returning null. How I can shadow the PackageManager? I tried creating a ShadowPackageManager and calling bindShadowClass, but none of my code gets executed - getPackageManager() always returns null. I also tried to Shadow the Application context and return a concrete StubPackageManager, but got the same results. Maybe I've been searching/staring too long - is there a better way to unit test this method?

like image 677
mjancola Avatar asked Oct 15 '12 19:10

mjancola


4 Answers

I'm using Robolectric 2.3 for this. As noted in other answers, getPackageManager() does not return null, but shadowApplication.setPackageManager no longer exists.

Since you can't mock PackageManager, you can't give it a list of Intents to resolve for. Fortunately, Robolectric's PackageManager subclass, RobolectricPackageManager, can let you add these intents without a mock:

RobolectricPackageManager rpm = (RobolectricPackageManager)Robolectric.application.getPackageManager();
rpm.addResolveInfoForIntent(new Intent(Settings.ACTION_APPLICATION_DEVELOPMENT_SETTINGS), new ResolveInfo());
like image 169
aleph_null Avatar answered Dec 16 '22 08:12

aleph_null


For some reason you need to set the shadow packagemanager manually on your application. Create a custom test runner (by extending RobolectricTestRunner) and override the setApplicationState method:

public class MyTestRunner extends RobolectricTestRunner {   
  @Override
  public void setupApplicationstate(RobolectricConfig robolectricConfig) {
     super.setupApplicationState(robolectricConfig);
     ShadowApplication shadowApplication = shadowOf(Robolectric.application);
     shadowApplication.setPackageName(robolectricConfig.getPackageName());
     shadowApplication.setPackageManager(new RobolectricPackageManager(Robolectric.application, robolectricConfig));
  }
}

Then specify in your tests that you want to use your own test runner:

@RunWith(MyTestRunner.class)
public class MyTest { ... }
like image 33
Jan Berkel Avatar answered Dec 16 '22 09:12

Jan Berkel


I upgraded to the latest Robolectric (version 2.1.1) and the PackageManager doesn't come up null anymore.

The code below verifies that a browser intent is fired (and configured with a url). I haven't tested this on 1.x, but I think it works there too:

@Test
public void recipeTitleShouldOpenBrowserOnClick() throws Exception
{
    title.performClick();
    ShadowActivity shadowActivity = shadowOf( detailFragment.getActivity() );
    ShadowActivity.IntentForResult intent = shadowActivity.peekNextStartedActivityForResult();

    // or
    // ShadowActivity.IntentForResult intent = shadowActivity.getNextStartedActivityForResult();

    assertThat( intent.intent,
                equalTo( createBrowserIntentWithURL( "url" ) ) );
}

Note: I'm invoking start activity from a fragment here.

like image 27
colabug Avatar answered Dec 16 '22 08:12

colabug


Just add on to aleph_null's answer, you can use ShadowResolveInfo.newResolveInfo() to quickly create a mock ResolveInfo ready to be used (I'm using Robolectric 2.4).

RobolectricPackageManager rpm = (RobolectricPackageManager)Robolectric.application.getPackageManager();
rpm.addResolveInfoForIntent(new Intent(Settings.ACTION_APPLICATION_DEVELOPMENT_SETTINGS), ShadowResolveInfo.newResolveInfo(...));
like image 21
hidro Avatar answered Dec 16 '22 07:12

hidro