GestureDetector with Robolectric

[Benjamin Layet]

I am using the GestureDetector in my app and it works fine on a real device.

When testing with Robolectric, it does not call back the listener after simulating an ACTION_DOWN event.

Activity:

public class MainActivity extends Activity {

public GestureHandler gestureHandler = new GestureHandler();

public GestureDetector detector ;

public TextView tv;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

tv = (TextView) findViewById(R.id.hello_world);

detector = new GestureDetector(this, gestureHandler);

}

@Override

public boolean onTouchEvent(MotionEvent event) {

detector.onTouchEvent(event);

tv.setText("Gesture: " + gestureHandler.gesture);

return true;

}

}

GestureHandler:

public class GestureHandler extends SimpleOnGestureListener

{

public String gesture ="";

@Override

public boolean onDown(MotionEvent e) {

gesture = "onDown";

return true;

}

}

Test:

@RunWith(RobolectricTestRunner.class)

public class SimpleGestureDetectorTest {

private boolean eventSent = false;

MainActivity activity;

@Before

public void setUp() {

activity = Robolectric.buildActivity(MainActivity.class).create().get();

}

@Test

public void testCurrentThreadActionDown() {

currentThreadActionDown(200, 400);

assertEquals("onDown", activity.gestureHandler.gesture);

}

@Test

public void testUiThreadActionDown() throws InterruptedException {

final Object mutex = new Object();

activity.runOnUiThread(new Runnable() {

@Override

public void run() {

currentThreadActionDown(200, 400);

synchronized (mutex) {

eventSent = true;

mutex.notifyAll();

}

}

});

synchronized (mutex) {

if (!eventSent) {

mutex.wait(5000);

}

if (!eventSent) {

fail("Event not sent in UI thread");

}

}

// Assert that the event was properly forwarded

assertEquals("onDown", activity.gestureHandler.gesture);

}

private void currentThreadActionDown(float x, float y) {

long downTime = SystemClock.uptimeMillis();

// Obtain MotionEvent object

MotionEvent motionEvent = MotionEvent.obtain(downTime, // time of first

// down

downTime, // time of event

MotionEvent.ACTION_DOWN, // type of event

x, y, // event origin

0 // meta state

);

// send event directly to the activity

activity.onTouchEvent(motionEvent);

motionEvent.recycle();

}

}

Both tests fail : in UI thread and in current thread.

If  UI thread test is executed within an instrumentation test on a real device, it does not fail.

Is there a way to use Robolectric when using GestureDetector and ScaleGestureDetector ?

[Benjamin Layet]

Additional info: this was executed with robolectric-2.2-20130730.193729-26-jar-with-dependencies.jar

[Jake Wharton]

I can't speak to what the actual implementation of GestureDetector in Robolectric is, but I will say that you are probably testing the wrong thing. If you know that the GestureDetector calls your onTouchEvent method then you should be calling that method directly from your test. This way you are testing how your application reacts to an event rather than testing the fact that Android calls the callback. This is the spirit of unit tests. You want to test how your code handles situations rather than how Android behaves.

Your test should probably be something more like this:

    MainActivity activity;

    @Before
    public void setUp() {
        activity = Robolectric.buildActivity(MainActivity.class).create().get();
    }

    @Test

    public void testActionDownSetsTextViewText() {
        activity.gestureHandler.gesture = "onDown";
        activity.onTouchEvent(MotionEvent.obtain(20, System.currentTimeMillis(), ACTION_DOWN, 200, 400, 0));
        assertEquals("Gesture: onDown", activity.tv.getText().toString());
    }

---
Jake Wharton
http://about.me/jakewharton

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