def test_on_show_view_called():
window = Window()
view = View(window)
show_mock = Mock()
view.on_show_view = show_mock
window.show_view(view)
show_mock.assert_called_once()
window.close()
def test_on_hide_view_called():
window = Window()
view1 = View(window)
view2 = View(window)
window.show_view(view1)
hide_mock = Mock()
view1.on_hide_view = hide_mock
window.show_view(view2)
hide_mock.assert_called_once()
window.close()