How to test an IntentService with Robolectric?

问题

I'm trying to test the onHandleIntent() method of an IntentService using Robolectric.

I'm starting the service with:

Activity activity = new Activity();
Intent intent = new Intent(activity, MyService.class);
activity.startService(intent);

ShadowActivity shadowActivity = Robolectric.shadowOf(activity);
Intent startedIntent = shadowActivity.getNextStartedService();
assertNotNull(startedIntent);

seems like startedIntent is not null, but onHandleIntent() doesn't seem to be called.

how should I test it ?

回答1:

Robolectric has a ServiceController that can go thru service lifecycle just like activity. This controller provides all methods to execute corresponding service callbacks (e.g. controller.attach().create().startCommand(0, 0).destroy()).

Theoretically we can expect that IntentService.onStartCommand() will trigger IntentService.onHandleIntent(Intent), via its internal Handler. However this Handler uses a Looper which runs on a background thread, and I have no idea how to make this thread advance to next task. A workaround would be to create TestService that mimics the same behavior, but triggers onHandleIntent(Intent) on main thread (thread used to run tests).

@RunWith(RobolectricGradleTestRunner.class)
public class MyIntentServiceTest {
    private TestService service;
    private ServiceController<TestService> controller;

    @Before
    public void setUp() {
        controller = Robolectric.buildService(TestService.class);
        service = controller.attach().create().get();
    }

    @Test
    public void testWithIntent() {
        Intent intent = new Intent(RuntimeEnvironment.application, TestService.class);
        // add extras to intent
        controller.withIntent(intent).startCommand(0, 0);
        // assert here
    }

    @After
    public void tearDown() {
        controller.destroy();
    }

    public static class TestService extends MyIntentService {
        public boolean enabled = true;

        @Override
        public void onStart(Intent intent, int startId) {
            // same logic as in internal ServiceHandler.handleMessage()
            // but runs on same thread as Service
            onHandleIntent(intent);
            stopSelf(startId);
        }
    }
}

UPDATE: Alternatively, it's quite straightforward to create a similar controller for IntentService, as follows:

public class IntentServiceController<T extends IntentService> extends ServiceController<T> {
    public static <T extends IntentService> IntentServiceController<T> buildIntentService(Class<T> serviceClass) {
        try {
            return new IntentServiceController<>(Robolectric.getShadowsAdapter(), serviceClass);
        } catch (IllegalAccessException | InstantiationException e) {
            throw new RuntimeException(e);
        }
    }

    private IntentServiceController(ShadowsAdapter shadowsAdapter, Class<T> serviceClass) throws IllegalAccessException, InstantiationException {
        super(shadowsAdapter, serviceClass);
    }

    @Override
    public IntentServiceController<T> withIntent(Intent intent) {
        super.withIntent(intent);
        return this;
    }

    @Override
    public IntentServiceController<T> attach() {
        super.attach();
        return this;
    }

    @Override
    public IntentServiceController<T> bind() {
        super.bind();
        return this;
    }

    @Override
    public IntentServiceController<T> create() {
        super.create();
        return this;
    }

    @Override
    public IntentServiceController<T> destroy() {
        super.destroy();
        return this;
    }

    @Override
    public IntentServiceController<T> rebind() {
        super.rebind();
        return this;
    }

    @Override
    public IntentServiceController<T> startCommand(int flags, int startId) {
        super.startCommand(flags, startId);
        return this;
    }

    @Override
    public IntentServiceController<T> unbind() {
        super.unbind();
        return this;
    }

    public IntentServiceController<T> handleIntent() {
        invokeWhilePaused("onHandleIntent", getIntent());
        return this;
    }
}

回答2:

onHandleIntent is a protected method so it can't be called directly.

my solution was to extend the service class in my test case, override onHandleIntent making it public and calling super.onHandleIntent(intent)

then call onHandleIntent directly from the test case.

回答3:

Robolectric 3.1+

Create an instance of your service

Call onHandleIntent directly

    YourService svc = Robolectric.buildService(YourService.class).get();
    Intent fakeIntent = new Intent();
    fakeIntent.putExtra(YourService.SOME_EXTRA, "debug|fail");

    svc.onHandleIntent(fakeIntent);

    assertThat(something.happened).isEqualTo(true);

Note: use Robolectric.buildService (not .buildIntentService) even if you're testing an IntentService. .buildIntentService is currently not working, as far as I can tell.

Update 2017-05-17:

Issue with buildIntentService will be fixed in future

回答4:

I think you have approached this the wrong way. You are testing here:

Intent startedIntent = shadowActivity.getNextStartedService();
assertNotNull(startedIntent);

that startService()was called.

You then must assume that Android has implemented their end correctly and that after calling startService() the service will indeed be started.

I think that if you want to test the behavior of onHandleIntent(), you must just call it directly??

I am not sure exactly... but I think the test you want to write would just be testing the Android framework. You should write two tests.

1) Test that startService() is called (as you have in your example).

2) Test the behaviour of onHandleIntent() (by calling it directly).

I have very little experience with Robolectric but hopefully this is helpful.

Cheers

回答5:

I use this

@Before
public void setup(){
    mainActivity = Robolectric.buildActivity(MainActivity.class)
            .create()
            .start()
            .resume()
            .get();
    context = Robolectric.getShadowApplication().getApplicationContext();
    bt_start = (Button) mainActivity.findViewById(R.id.button);
    bt_stop = (Button) mainActivity.findViewById(R.id.button2);
}

@Test
public void serviceIsOn(){

    bt_start.performClick();
    Intent intent = Robolectric.shadowOf(mainActivity).peekNextStartedService();
    assertEquals(MiService.class.getCanonicalName(),intent.getComponent().getClassName());
}

and then I run the test and all is ok

来源：https://stackoverflow.com/questions/12025611/how-to-test-an-intentservice-with-robolectric

标签

android

android-testing

robolectric