def METHOD_NAME():
    # test noise columns are appended to input dataframe and feature_metadata
    X = pd.DataFrame({"a": [1, 2]})
    args = {"rng": np.random.default_rng(0), "count": 2}
    X_noised, noise_columns = add_noise_column(X, **args)
    expected_features = X.columns.tolist() + noise_columns
    assert expected_features == X_noised.columns.tolist()