def test_base_class_convert_html_in_suggestion_change(self):
        def conversion_fn():
            """Temporary function."""
            pass
        with self.assertRaisesRegex(
            NotImplementedError,
            'Subclasses of BaseSuggestion should implement'
            ' convert_html_in_suggestion_change.'):
            self.base_suggestion.convert_html_in_suggestion_change(
                conversion_fn)