How to mock MotionEvent and SensorEvent for Unit Testing in android?
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 ?
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 ?
Here's how you could mock a SensorEvent for an accelerometer event:
private SensorEvent getAccelerometerEventWithValues(
float[] desiredValues) throws Exception {
// Create the SensorEvent to eventually return.
SensorEvent sensorEvent = Mockito.mock(SensorEvent.class);
// Get the 'sensor' field in order to set it.
Field sensorField = SensorEvent.class.getField("sensor");
sensorField.setAccessible(true);
// Create the value we want for the 'sensor' field.
Sensor sensor = Mockito.mock(Sensor.class);
when(sensor.getType()).thenReturn(Sensor.TYPE_ACCELEROMETER);
// Set the 'sensor' field.
sensorField.set(sensorEvent, sensor);
// Get the 'values' field in order to set it.
Field valuesField = SensorEvent.class.getField("values");
valuesField.setAccessible(true);
// Create the values we want to return for the 'values' field.
valuesField.set(sensorEvent, desiredValues);
return sensorEvent;
}
Change the type or values as appropriate to your use case.
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