def corofunc1():
            called[0] += 1
            return event.ReturnValue(insert_events=[evt2], append_events=[evt])
def test_base_class_get_all_html_content_strings(self):
        with self.assertRaisesRegex(
            NotImplementedError,
            'Subclasses of BaseSuggestion should implement'
            ' get_all_html_content_strings.'):
            self.base_suggestion.get_all_html_content_strings()