Robolectric using Fragments and ActionBarCompat NullPointerException

Question

I have an Android app that uses fragments and implemented ActionBarCompat. I wrote a simple Robolectric test, shown below:

@Test public void shouldNotBeNull() throws Exception { MainFragment mainFragment = new MainFragment(); startFragment(mainFragment); assertThat(mainFragment, notNullValue()); assertThat(mainFragment.getActivity(), notNullValue()); } private void startFragment(MainFragment fragment) { FragmentActivity activity = new FragmentActivity(); shadowOf(activity).callOnCreate(null); shadowOf(activity).callOnStart(); shadowOf(activity).callOnResume(); FragmentManager fragmentManager = activity.getSupportFragmentManager(); FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); fragmentTransaction.add(fragment, null); fragmentTransaction.commit(); } 

I get the following exception:

 java.lang.NullPointerException: null at android.app.Activity.invalidateOptionsMenu(Activity.java:2595) at android.support.v4.app.ActivityCompatHoneycomb.invalidateOptionsMenu(ActivityCompatHoneycomb.java:30) at android.support.v4.app.FragmentActivity.supportInvalidateOptionsMenu(FragmentActivity.java:572) at android.support.v4.app.Fragment.setHasOptionsMenu(Fragment.java:708) at com.example.android.ui.MainFragment.onCreate(MainFragment.java:599) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:834) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1080) at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:622) at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1416) at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:420) at org.robolectric.util.Scheduler.postDelayed(Scheduler.java:37) at org.robolectric.shadows.ShadowLooper.post(ShadowLooper.java:198) at org.robolectric.shadows.ShadowHandler.postDelayed(ShadowHandler.java:56) at org.robolectric.shadows.ShadowHandler.post(ShadowHandler.java:51) at android.os.Handler.post(Handler.java) at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1322) at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:541) at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:525) at com.example.android.ui.MainFragmentTest.startFragment(MainFragmentTest.java:36) at com.example.android.ui.MainFragmentTest.shouldNotBeNull(MainFragmentTest.java:22) 

When using something like this:

 MainActivity activity = new MainActivity(); shadowOf(activity).callOnCreate(null); shadowOf(activity).callOnStart(); shadowOf(activity).callOnResume(); 

where MainActivity is the owner activity for MainFragment, I get the following exception:

 java.lang.RuntimeException: java.lang.reflect.InvocationTargetException at org.robolectric.res.builder.RobolectricPackageManager.getActivityInfo(RobolectricPackageManager.java:59) at android.support.v7.app.ActionBarActivityDelegate.getUiOptionsFromMetadata(ActionBarActivityDelegate.java:157) at android.support.v7.app.ActionBarActivityDelegateICS.onCreate(ActionBarActivityDelegateICS.java:53) at android.support.v7.app.ActionBarActivity.onCreate(ActionBarActivity.java:98) at com.example.android.ui.MainActivity.onCreate(MainActivity.java:45) at org.robolectric.shadows.ShadowActivity.invokeReflectively(ShadowActivity.java:176) at org.robolectric.shadows.ShadowActivity.callOnCreate(ShadowActivity.java:121) at com.example.android.ui.MainFragmentTest.startFragment(MainFragmentTest.java:28) at com.example.android.ui.MainFragmentTest.shouldNotBeNull(MainFragmentTest.java:22) 

I suspect it could be something like ActionBarCompat and Robolectric, which are incompatible. Any help would be appreciated.

Answer 1

As with Robolectric 2.4, it must support the Appcompat library. There are several gotchas, though, since this does not work out of the box. Things that helped me:

• Creating a project.properties file with the following contents

As described in the setup guide :

 target=android-19 android.library.reference.1=/../../build/intermediates/exploded-aar/com.android.support/appcompat-v7/20.0.0 android.library.reference.2=/../../build/intermediates/exploded-aar/com.android.support/support-v4/20.0.0 android.library.reference.3=/../../build/intermediates/exploded-aar/com.viewpagerindicator/library/2.4.1 

2. Install exculdes in build.gradle for Robolectric

Apparently, Robolectric has its own versions of support libraries, so to prevent possible duplicate dependencies (see here ):

  androidTestCompile('org.robolectric:robolectric:2.4') { exclude module: 'classworlds' exclude module: 'commons-logging' exclude module: 'httpclient' exclude module: 'maven-artifact' exclude module: 'maven-artifact-manager' exclude module: 'maven-error-diagnostics' exclude module: 'maven-model' exclude module: 'maven-project' exclude module: 'maven-settings' exclude module: 'plexus-container-default' exclude module: 'plexus-interpolation' exclude module: 'plexus-utils' exclude module: 'wagon-file' exclude module: 'wagon-http-lightweight' exclude module: 'wagon-provider-api' exclude group: 'com.android.support', module: 'support-v4' exclude group: 'com.android.support', module: 'appcompat-v7' }