IssueTracker

Library used (Espresso, Runner, Rules etc.): "com.android.support.test:rules"
Version used: "1.0.1"

What steps will reproduce the problem?
Test an `Activity`'s `setResult()` using `ActivityTestRule.getActivityResult()` and Espresso.
If the activity undergoes a configuration change (such as display rotation) during the test, `ActivityTestRule.getActivity()` will still return the previous instance of the activity (the one existing before the configuration change). This will make any subsequent calls to `ActivityTestRule.getActivityResult()` throw `IllegalStateException` with error message: "Activity is not finishing!".

Example code snippet:

@Rule
public ActivityTestRule<MyActivity> rule = new ActivityTestRule<>(MyActivity.class);

@Test
public void myTest() throws Exception {
    rule.getActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
    Espresso.onView(ViewMatchers.withId(R.id.button)).perform(click()); // In MyActivity this button click will trigger setResult() and finish().
    Instrumentation.ActivityResult result = activityTestRule.getActivityResult(); // Test will crash here.
}