def test_end(self):
writer = CalendarWriter(six.BytesIO())
writer.start_contentline = MagicMock()
writer.value = MagicMock()
writer.end_contentline = MagicMock()
writer.end(sentinel.section)
writer.start_contentline.assert_called_once_with("END")
writer.value.assert_called_once_with(sentinel.section)
writer.end_contentline.assert_called_once()
