        DfCleaner.clean_column_names_in_place(pd.DataFrame({'seconds': [3600]}, columns=['seconds']))

    def test_rename_column_names_in_place_method(self):
        DfCleaner.rename_column_names_in_place(pd.DataFrame({'seconds': [3600]}, columns=['seconds']),
                                               {'seconds': 'sec'})

    def test_set_columns_to_numeric_method(self):