Android: Writing test cases for Fragments

Question

In my previous projects I've done most of the work through Activities and used ActivityInstrumentationTestCase2 as per the document:
http://developer.android.com/tools/testing/activity_testing.html
I have an idea how to work with Activity Test cases; but when it comes to Fragment ,I don't have much idea nor found much documents related to that. So how to write test cases when I have several fragments with one or two actvities? Any example code or sample would be more helpful.

Answer 1

Here's a rough guide using ActivityInstrumentationTestCase2:

Step 1. Create a blank Activity to hold your fragment(s)

  private static class FragmentUtilActivity extends Activity {     @Override     protected void onCreate(Bundle savedInstanceState) {       super.onCreate(savedInstanceState);       LinearLayout view = new LinearLayout(this);       view.setId(1);        setContentView(view);     }   } 

Step 2: Inside your test, instantiate your fragment and add it to the blank activity

public class MyFragmentTest extends ActivityInstrumentationTestCase2<FragmentUtilActivity> {      private MyFragment fragment;      @Before     public void setup() {         fragment = new MyFragment();         getActivity().getFragmentManager().beginTransaction().add(1, fragment, null).commit();     } } 

Step 3 Test your instantiated fragment

@Test public void aTest() {     fragment.getView().findViewById(...); } 

---

If you're using robolectric, this is pretty straightforward using the FragmentUtilTest class:

@Test public void aTest() {     // instantiate your fragment     MyFragment fragment = new MyFragment();      // Add it to a blank activity     FragmentTestUtil.startVisibleFragment(fragment);      // ... call getView().findViewById() on your fragment } 

Answer 2

Here is my working solution:

1. Create an instrumentation unit test class for this in androidTest directory, i.e.:

   public class FragmentTest extends  ActivityInstrumentationTestCase2<MainActivity> {      private MainActivity testingActivity;      private TestFragment testFragment;      //...  } 

2. call this constructor inside this new class:

   public FragmentTest() {      super(MainActivity.class); } 

3. override the setUp() method (be sure to have R.id.fragmentContainer in your Activity class) where you will call at the end waitForIdleSync():

   @Override protected void setUp() throws Exception {     super.setUp();      // Starts the activity under test using     // the default Intent with:     // action = {@link Intent#ACTION_MAIN}     // flags = {@link Intent#FLAG_ACTIVITY_NEW_TASK}     // All other fields are null or empty.     testingActivity = getActivity();      testFragment = new TestFragment();     testingActivity.getFragmentManager().beginTransaction().add(R.id.fragmentContainer,testFragment,null).commit();     /**      * Synchronously wait for the application to be idle.  Can not be called      * from the main application thread -- use {@link #start} to execute      * instrumentation in its own thread.      *      * Without waitForIdleSync(); our test would have nulls in fragment references.      */     getInstrumentation().waitForIdleSync(); } 

4. Write a test method, for example somethng like:

   public void testGameFragmentsTextViews() {     String empty = "";    TextView textView = (TextView)testFragment.getView().findViewById(R.id.myTextView);    assertTrue("Empty stuff",(textView.getText().equals(empty)));    } 

5. Run the test.