Function test_subcommand_attachment_errors

tests/test_argparse_utils.py:448–480

()

def test_subcommand_attachment_errors() -> None:
    root_parser = Cmd2ArgumentParser(prog="root", description="root command")
    child_parser = Cmd2ArgumentParser(prog="child", description="child command")

    # Verify ValueError when subcommands are not supported
    with pytest.raises(ValueError, match="Command 'root' does not support subcommands"):
        root_parser.attach_subcommand([], "anything", child_parser)
    with pytest.raises(ValueError, match="Command 'root' does not support subcommands"):
        root_parser.detach_subcommand([], "anything")

    # Allow subcommands for the next tests
    root_parser.add_subparsers()

    # Verify ValueError when path is invalid (find_parser() fails)
    with pytest.raises(ValueError, match="Subcommand 'nonexistent' does not exist for 'root'"):
        root_parser.attach_subcommand(["nonexistent"], "anything", child_parser)
    with pytest.raises(ValueError, match="Subcommand 'nonexistent' does not exist for 'root'"):
        root_parser.detach_subcommand(["nonexistent"], "anything")

    # Verify ValueError when path is valid but subcommand name is wrong
    with pytest.raises(ValueError, match="Subcommand 'fake' does not exist for 'root'"):
        root_parser.detach_subcommand([], "fake")

    # Verify TypeError when attaching a non-Cmd2ArgumentParser type
    ap_parser = argparse.ArgumentParser(prog="non-cmd2-parser")
    with pytest.raises(TypeError, match=r"must be an instance of 'Cmd2ArgumentParser' \(or a subclass\)"):
        root_parser.attach_subcommand([], "sub", ap_parser)  # type: ignore[arg-type]

    # Verify ValueError when subcommand name already exists
    sub_parser = Cmd2ArgumentParser(prog="sub")
    root_parser.attach_subcommand([], "sub", sub_parser)
    with pytest.raises(ValueError, match="Subcommand 'sub' already exists for 'root'"):
        root_parser.attach_subcommand([], "sub", sub_parser)


def test_subcommand_attachment_parser_class_override() -> None: