def dist(a, b):
    return sum((i-j)**2 for i, j in zip(a, b))
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()