How can I test fragments with Robolectric?

Question

I know there is a Robolectric.shadowOf(Fragment) method and a ShadowFragment class, thought they aren't listed on the docs, but I can't make it work.

myFragment = new MyFragment(); myFragment.onCreateView(LayoutInflater.from(activity), (ViewGroup) activity.findViewById(R.id.container), null); myFragment.onAttach(activity); myFragment.onActivityCreated(null);  

I'm working with API level 13 (Honeycomb).

Thanks.

Answer 1

Edit #4 & #5: In Robolectric 3.*, they split up the fragment starting functions.

For support fragments, you will need to add a dependency to your build.gradle:

testCompile "org.robolectric:shadows-supportv4:3.8" 

Import: org.robolectric.shadows.support.v4.SupportFragmentTestUtil.startFragment;

For platform fragments, you don't need this dependency. Import: import static org.robolectric.util.FragmentTestUtil.startFragment;

They both use the same name of startFragment().

import static org.robolectric.shadows.support.v4.SupportFragmentTestUtil.startFragment;  @RunWith(RobolectricTestRunner.class) @Config(constants = BuildConfig.class) public class YourFragmentTest {     @Test     public void shouldNotBeNull() throws Exception     {         YourFragment fragment = YourFragment.newInstance();         startFragment( fragment );         assertNotNull( fragment );     } } 

Edit #3: Robolectric 2.4 has an API for support and regular fragments. You can either use the newInstance() pattern or use the constructor when constructing your Fragment's.

import org.junit.Test; import org.junit.runner.RunWith; import static org.junit.Assert.assertNotNull; import static org.robolectric.util.FragmentTestUtil.startFragment;  @RunWith(RobolectricGradleTestRunner.class) public class YourFragmentTest {     @Test     public void shouldNotBeNull() throws Exception     {         YourFragment fragment = new YourFragment();         startFragment( fragment );         assertNotNull( fragment );     } } 

Edit #2: There's a new helper if you're using support fragments (one that supports regular activities/fragments should be in the next release):

import static org.robolectric.util.FragmentTestUtil.startFragment;  @Before public void setUp() throws Exception {     fragment = YourFragment.newInstance();     startFragment( fragment ); } 

Edit: If you upgraded to Robolectric 2.0:

public static void startFragment( Fragment fragment ) {     FragmentActivity activity = Robolectric.buildActivity( FragmentActivity.class )                                            .create()                                            .start()                                            .resume()                                            .get();      FragmentManager fragmentManager = activity.getSupportFragmentManager();     FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();     fragmentTransaction.add( fragment, null );     fragmentTransaction.commit(); } 

Original answer

As the other commenter suggested, you do need to use the fragment manager (instead of calling the lifecycle methods you listed above).

@RunWith(MyTestRunner.class) public class YourFragmentTest {     @Test     public void shouldNotBeNull() throws Exception     {         YourFragment yourFragment = new YourFragment();         startFragment( yourFragment );         assertNotNull( yourFragment );     } 

I create a test runner and have a function that starts up a fragment for me so I can use it everywhere.

public class MyTestRunner extends RobolectricTestRunner {     public MyTestRunner( Class<?> testClass ) throws InitializationError     {         super( testClass );     }      public static void startFragment( Fragment fragment )     {         FragmentManager fragmentManager = new FragmentActivity().getSupportFragmentManager();         FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();         fragmentTransaction.add( fragment, null );         fragmentTransaction.commit();     } } 

Answer 2

You guys are all doing this the hard way. Just use FragmentTestUtil.

FragmentTestUtil.startFragment(yourfragment);