def test_base_class_populate_old_value_of_change_raises_error(self):
    with self.assertRaisesRegexp(NotImplementedError, 'Subclasses of BaseSuggestion should implement populate_old_value_of_change.'):
        self.base_suggestion.populate_old_value_of_change()
def test_base_class_populate_old_value_of_change_raises_error(self):
    with self.assertRaisesRegexp(NotImplementedError, 'Subclasses of BaseSuggestion should implement populate_old_value_of_change.'):
        self.base_suggestion.populate_old_value_of_change()