def METHOD_NAME(cls) -> pd.DataFrame:
    """Loads the CSV, override to inject data in a test."""
    assert cls.COMMON_DF_CSV_PATH, f"No path in {cls}"
    data_root = dataset_utils.DATA_DIRECTORY
    input_path = data_root / cls.COMMON_DF_CSV_PATH
    return common_df.read_csv(input_path, set_index=False)