@Test public void testAddToBackStack() {

	// Arrange:
   	final FragmentRequest request = new FragmentRequest(mock(FragmentController.class), FragmentRequest.NO_ID);
	// Act + Assert:
	assertThat(request.addToBackStack(true).addToBackStack(), is(true));
	assertThat(request.hasFlag(FragmentRequest.ADD_TO_BACK_STACK), is(true));
	assertThat(request.addToBackStack(false).addToBackStack(), is(false));
	assertThat(request.hasFlag(FragmentRequest.ADD_TO_BACK_STACK), is(false));
}