How to mock MotionEvent and SensorEvent for Unit Testing in android?

Question

How to unit test android SensorEvent and MotionEvent classes ?

I need to create one MotionEvent object for Unit testing. (We have obtain method for MotionEvent that we can use after mocking to create MotionEvent custom object )

For MotionEvent class, I have tried with Mockito like :

MotionEvent Motionevent = Mockito.mock(MotionEvent.class);

But following error I am getting on Android Studio:

java.lang.RuntimeException:

Method obtain in android.view.MotionEvent not mocked. See https://sites.google.com/a/android.com/tools/tech-docs/unit-testing-support for details.
    at android.view.MotionEvent.obtain(MotionEvent.java)

Following the site mentioned on this error, I have added

testOptions {
        unitTests.returnDefaultValues = true
    }

on build.gradle , but still I am getting this same error . Any idea on this ?

Answer 1

I have finally implemented it for MotionEvent by using Roboelectric

import android.view.MotionEvent;

import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.robolectric.annotation.Config;

import static org.junit.Assert.assertTrue;

import org.robolectric.RobolectricGradleTestRunner;

@RunWith(RobolectricGradleTestRunner.class)
@Config(constants = BuildConfig.class)
public class ApplicationTest {

    private MotionEvent touchEvent;

    @Before
    public void setUp() throws Exception {
        touchEvent = MotionEvent.obtain(200, 300, MotionEvent.ACTION_MOVE, 15.0f, 10.0f, 0);
    }
    @Test
    public void testTouch() {
      assertTrue(15 == touchEvent.getX());
    }
}

How can we do the same thing for SensorEvents ?