def METHOD_NAME(tmp_path):
    """
    Test case where bias values are stored in a single file (mean value over
    multiple historic forecasts).
    """
    kgo_dir = acc.kgo_root() / "apply-bias-correction"
    kgo_path = kgo_dir / "single_bias_file" / "kgo.nc"
    fcst_path = kgo_dir / "20220814T0300Z-PT0003H00M-wind_speed_at_10m.nc"
    bias_file_path = (
        kgo_dir
        / "single_bias_file"
        / "bias_data"
        / "20220813T0300Z-PT0003H00M-wind_speed_at_10m.nc"
    )
    output_path = tmp_path / "output.nc"
    args = [
        fcst_path,
        bias_file_path,
        "--output",
        output_path,
    ]
    run_cli(args)
    acc.compare(output_path, kgo_path)