def METHOD_NAME(df):
    """Checks the `fill_remaining` parameter works as expected when value
    is a scalar."""
    df = df.add_column("fill_in_scalar", 42, fill_remaining=True)
    series = pd.Series([42 for _ in range(len(df))])
    series.name = "fill_in_scalar"
    assert_series_equal(df["fill_in_scalar"], series)