Function test_parser_implicit_output_to

tests/test_argparse_utils.py:702–725

Test that print_help() and print_usage() use thread-local context when no file is provided.

(mocker: MockerFixture)

def test_parser_implicit_output_to(mocker: MockerFixture) -> None:
    """Test that print_help() and print_usage() use thread-local context when no file is provided."""
    import io

    parser = Cmd2ArgumentParser(prog="test")
    buf = io.StringIO()

    mock_formatter_class = mocker.patch("cmd2.argparse_utils.Cmd2HelpFormatter", autospec=True)
    parser.formatter_class = mock_formatter_class
    mock_formatter_class.return_value.format_help.return_value = "Help/Usage Text"

    # Shadow the output file
    with parser.output_to(buf):
        # Call print_help without a file argument
        parser.print_help()
        # Verify Cmd2HelpFormatter was instantiated with file=buf (from thread-local)
        mock_formatter_class.assert_called_with(prog="test", file=buf)

        mock_formatter_class.reset_mock()

        # Call print_usage without a file argument
        parser.print_usage()
        # Verify Cmd2HelpFormatter was instantiated with file=buf (from thread-local)
        mock_formatter_class.assert_called_with(prog="test", file=buf)


@with_ansi_style(ru.AllowStyle.NEVER)