android-testing-runtime-permissions-should-display-long-rationale

ContactsSyncTest.java

@Test
public void c_shouldDisplayLongRationaleIfPermissionWasDeniedPermanently() throws Exception {  
    denyCurrentPermissionPermanently(device);

    onView(withText(R.string.permission_denied_rationale_long)).check(matches(isDisplayed()));
    onView(withText(R.string.grant_permission)).check(matches(isDisplayed()));

    // will grant the permission for the next test
    onView(withText(R.string.grant_permission)).perform(click());
    openPermissions(device);
    grantPermission(device, "Contacts");
}