Camera Operation UI testing with Espresso

Question

I need to automate my UI testing for following operation with espresso test project.

Operation:

Click a button that opens my phone camera. Capture Image, and save the image in sdcard storage. Also update a small image view on the screen when done.

App works fine but with all other operations and similar type of above operation it becomes a time consuming process to test it manually again and again.

Answer 1

I was working with similar problem and found best available solution at below link Camera UI test

// CameraActivityInstrumentationTest.java
public class CameraActivityInstrumentationTest {

    // IntentsTestRule is an extension of ActivityTestRule. IntentsTestRule sets up Espresso-Intents
    // before each Test is executed to allow stubbing and validation of intents.
    @Rule
    public IntentsTestRule<CameraActivity> intentsRule = new IntentsTestRule<>(CameraActivity.class);

    @Test
    public void validateCameraScenario() {
        // Create a bitmap we can use for our simulated camera image
        Bitmap icon = BitmapFactory.decodeResource(
                InstrumentationRegistry.getTargetContext().getResources(),
                R.mipmap.ic_launcher);

        // Build a result to return from the Camera app
        Intent resultData = new Intent();
        resultData.putExtra("data", icon);
        Instrumentation.ActivityResult result = new Instrumentation.ActivityResult(Activity.RESULT_OK, resultData);

        // Stub out the Camera. When an intent is sent to the Camera, this tells Espresso to respond 
        // with the ActivityResult we just created
        intending(toPackage("com.android.camera2")).respondWith(result);

        // Now that we have the stub in place, click on the button in our app that launches into the Camera
        onView(withId(R.id.btnTakePicture)).perform(click());

        // We can also validate that an intent resolving to the "camera" activity has been sent out by our app
        intended(toPackage("com.android.camera2"));

        // ... additional test steps and validation ...
    }
}

Answer 2

If you still have the need, you can use the new Espresso-Intent that mocks the activity result that you can use to test this flow. See the sample from Android Testing