Function test_register_argparse_argument_parameter

tests/test_argparse_utils.py:293–334

()

def test_register_argparse_argument_parameter() -> None:
    # Test successful registration
    param_name = "test_unique_param"
    register_argparse_argument_parameter(param_name)

    assert param_name in argparse_utils._CUSTOM_ACTION_ATTRIBS
    assert hasattr(argparse.Action, f"get_{param_name}")
    assert hasattr(argparse.Action, f"set_{param_name}")

    # Test duplicate registration
    expected_err = "already registered"
    with pytest.raises(KeyError, match=expected_err):
        register_argparse_argument_parameter(param_name)

    # Test invalid identifier
    expected_err = "must be a valid Python identifier"
    with pytest.raises(ValueError, match=expected_err):
        register_argparse_argument_parameter("invalid name")

    # Test collision with standard argparse.Action attribute
    expected_err = "conflicts with an existing attribute on argparse.Action"
    with pytest.raises(KeyError, match=expected_err):
        register_argparse_argument_parameter("format_usage")

    # Test collision with existing accessor methods
    try:
        argparse.Action.get_colliding_param = lambda self: None
        expected_err = "Accessor methods for 'colliding_param' already exist on argparse.Action"
        with pytest.raises(KeyError, match=expected_err):
            register_argparse_argument_parameter("colliding_param")
    finally:
        delattr(argparse.Action, "get_colliding_param")

    # Test collision with internal attribute
    try:
        attr_name = constants.cmd2_private_attr_name("internal_collision")
        setattr(argparse.Action, attr_name, None)
        expected_err = f"The internal attribute '{attr_name}' already exists on argparse.Action"
        with pytest.raises(KeyError, match=expected_err):
            register_argparse_argument_parameter("internal_collision")
    finally:
        delattr(argparse.Action, attr_name)


def test_subcommand_attachment() -> None: