How do you override a module/dependency in a unit test with Dagger 2.0?

Question

I have a simple Android activity with a single dependency. I inject the dependency into the activity\'s onCreate like this:

Dagger_HelloComponen         


        

Answer 1

I have solution for Roboletric 3.+.

I have MainActivity which i want to test without injection on create:

public class MainActivity extends BaseActivity{

  @Inject
  public Configuration configuration;

  @Inject
  public AppStateService appStateService;

  @Inject
  public LoginService loginService;

  @Override
    protected void onCreate(Bundle savedInstanceState) {
      super.processIntent(getIntent()); // this is point where pass info from test
      super.onCreate(savedInstanceState)
    ...
  }
  ...
 }

Next my BaseActivty:

public class BaseActivity extends AppCompatActivity {

  protected Logger mLog;

  protected boolean isTestingSession = false; //info about test session


  @Override
  protected void onCreate(@Nullable Bundle savedInstanceState) {
      if (!isTestingSession) { // check if it is in test session, if not enable injectig
          AndroidInjection.inject(this);
      }
      super.onCreate(savedInstanceState);
  }

  // method for receive intent from child and scaning if has item TESTING with true
  protected void processIntent(Intent intent) {
    if (intent != null && intent.getExtras() != null) {
        isTestingSession = intent.getExtras().getBoolean("TESTING", false);
    }
  }

finally my testclass:

@Before
public void setUp() throws Exception {
  ...
  // init mocks...
   loginServiceMock = mock(LoginService.class);
   locServiceMock = mock(LocationClientService.class);
   fakeConfiguration = new ConfigurationUtils(new ConfigurationXmlParser());
   fakeConfiguration.save(FAKE_XML_CONFIGURATION);
   appStateService = new AppStateService(fakeConfiguration, locServiceMock, RuntimeEnvironment.application);

   // prepare activity
   Intent intent = new Intent(RuntimeEnvironment.application, MainActivity.class);
   intent.putExtra("TESTING", true);
   ActivityController activityController = Robolectric.buildActivity(MainActivity.class, intent); // place to put bundle with extras

    // get the activity instance
    mainActivity = activityController.get();


    // init fields which should be injected
    mainActivity.appStateService = appStateService;
    mainActivity.loginService = loginServiceMock;
    mainActivity.configuration = fakeConfiguration;


    // and whoala 
    // now setup your activity after mock injection
    activityController.setup();

    // get views etc..
    actionButton = mainActivity.findViewById(R.id.mainButtonAction);
    NavigationView navigationView = mainActivity.findViewById(R.id.nav_view);

  ....
  }