How to rotate activity, I mean: screen orientation change using Espresso?

Question

I have decided that one of the testing criteria for my application tests with Google\'s Espresso is:

Test should maintain Activity state after s

Answer 1

If you have the only Activity in your test case, you can do:

1. Declare you test Rule.

@Rule
public ActivityTestRule mActivityTestRule = new ActivityTestRule<>(TestActivity.class);

2. Get you Activity and apply a screen rotation.

mActivityTestRule.getActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
mActivityTestRule.getActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

That's a piece of pie!