def METHOD_NAME(default_file, fake_config_dir):
    # With no value the default_file is used
    opts = parse("--save-config")
    assert opts["save_config"] == default_file
    # With a value, the value is used
    other_file = fake_config_dir / "other.cfg"
    opts = parse("--save-config", str(other_file))
    assert opts["save_config"] == other_file