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POUsing Robolectric to test code that starts an activity
 

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  1. POUsing Robolectric to test code that starts an activity
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    <p>I have some code I want to test with Robolectric. Basically I want to test that a button click launches an activity.</p> <p>HomeScreenFragment.java:</p> <pre><code>public class HomeScreenFragment extends Fragment { private Button mSignInButton; @Override public void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); // call to super class } @Override public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState){ // inflate view View view = inflater.inflate(R.layout.fragment_home_screen, parent, false); // handle sign in button mSignInButton = (Button)view.findViewById(R.id.sign_in_button); mSignInButton.setOnClickListener(new View.OnClickListener() { // anonymous inner class @Override public void onClick(View view) { Intent intent = new Intent(getActivity(), SignInActivity.class);// start sign in activity with intent startActivity(intent); // &lt;&lt;== ERROR HERE WHEN RUNNING TEST } } } } </code></pre> <p>My test looks like this: HomeSreenFragmentTest.java:</p> <pre><code>@RunWith(RobolectricTestRunner.class) public class HomeScreenFragmentTest { private Activity mHomeScreenActivity; private Fragment mTestFragment; private Button mSignInButton; @Before public void setup() throws Exception{ mHomeScreenActivity = Robolectric.buildActivity(HomeScreenActivity.class).create().get(); // start HomeScreenActivity, call through to onCreate() mTestFragment = mHomeScreenActivity.getFragmentManager().findFragmentById(R.id.home_screen_fragment_container);// get HomeScreenFragment // run onCreateView View testView = mTestFragment.onCreateView(LayoutInflater.from(mHomeScreenActivity), (ViewGroup) mHomeScreenActivity.findViewById(R.id.home_screen_fragment_container), null); // get button view mSignInButton = (Button)testView.findViewById(R.id.sign_in_button); } // clicking sign in button should launch SignInActivity @Test public void testSignInButton2() throws Exception{ mSignInButton.performClick(); &lt;&lt;=== ERROR STARTS HERE ShadowActivity shadowActivity = Robolectric.shadowOf(mHomeScreenActivity); // create shadow activity Intent startedIntent = shadowActivity.getNextStartedActivity(); // get intent of next activity on stack ShadowIntent shadowIntent = Robolectric.shadowOf(startedIntent); // create shadow intent which starts next activity assertEquals(SignInActivity.class.getName(), shadowIntent.getComponent().getClassName()); // compare shadow intent w/ desired next activity } </code></pre> <p>The problem I am having is with the test. The code itself works fine in emulator/on device. The problem is that when Robolectric runs the <code>performClick()</code> method, and then gets to <code>onClick()</code> then goes to <code>startActivity(intent)</code> it fails.</p> <p>Stacktrace:</p> <pre><code>java.lang.NullPointerException: null at android.app.Activity.startActivityFromFragment(Activity.java:3850) at android.app.Activity.startActivityFromFragment(Activity.java:3825) at android.app.Fragment.startActivity(Fragment.java:996) at android.app.Fragment.startActivity(Fragment.java:975) at com.********.android.***project*****.controller.HomeScreenFragment$1.onClick(HomeScreenFragment.java:42) at android.view.View.performClick(View.java:4084) at com.*********.android.***project***.HomeScreenFragmentTest.testSignInButton2(HomeScreenFragmentTest.java:83) </code></pre> <p>I know how to start an activity with Robolectric using the <code>Robolectric.buildActivity()</code> method. But this is for when I need an activity <strong>in testing</strong>. Why is Robolectric failing to run the <code>startActivity()</code> method in code? Is there a better way to test this?</p>
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    1. COThis seems like an actual Robolectric issue. The normal `startActivity` methods are handled by the `ShadowContextWrapper` but a `Fragment` is not a `Context` like `Activity` and `Service` objects are so it blows up trying to run real android code. I filed this as issue [#767](https://github.com/robolectric/robolectric/issues/767).
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    2. COIf you're interested in contributing to Robolectric, you could try forking it, writing a test for, and then creating the shadow method I described in the issue, and submitting a pull request. You can look at the other `startActivity()` methods for inspiration.
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