Demonstration of Dagger 2 per-test Activity injection
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@RunWith(AndroidJUnit4.class) | |
public class MyActivityTest { | |
@Rule public ActivityTestRule<MyActivity> activityTestRule = new ActivityTestRule<>(MyActivity.class, false, false); | |
private MyApp myApp; | |
@Before public void setup() { | |
myApp = (MyApp) InstrumentationRegistry.getTargetContext().getApplicationContext(); | |
} | |
@Test public void mockInjection() throws Exception { | |
// Create test object graph & inject. | |
DaggerMyActivityTest_TestAppComponent.builder() | |
.build() | |
.inject(myApp); | |
activityTestRule.launchActivity(new Intent(myApp, MyActivity.class)); | |
MyActivity myActivity = activityTestRule.getActivity(); | |
// Check things got injected correctly. | |
Assert.assertEquals("test-singleton-value", myActivity.singletonString); | |
Assert.assertEquals("test-per-activity-value", myActivity.perActivityString); | |
} | |
@Singleton @Component(modules = { TestAppModule.class, AndroidInjectionModule.class }) | |
public interface TestAppComponent { | |
void inject(MyApp myApp); | |
} | |
@Module | |
public static class TestAppModule { | |
@Provides @IntoMap @ActivityKey(MyActivity.class) | |
AndroidInjector.Factory<? extends Activity> factory() { | |
return new AndroidInjector.Factory<MyActivity>() { | |
@Override | |
public AndroidInjector<MyActivity> create(MyActivity instance) { | |
return new AndroidInjector<MyActivity>() { | |
@Override | |
public void inject(MyActivity instance) { | |
instance.singletonString = "test-singleton-value"; | |
instance.perActivityString = "test-per-activity-value"; | |
} | |
}; | |
} | |
}; | |
} | |
} | |
} |
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