borgmatic/tests/end-to-end/test_invalid_flag.py

import subprocess
import sys


def test_borgmatic_command_with_invalid_flag_shows_error_but_not_traceback():
    output = subprocess.run(  # noqa: PLW1510
        'borgmatic -v 2 --invalid'.split(' '),
        stdout=subprocess.PIPE,
        stderr=subprocess.STDOUT,
    ).stdout.decode(sys.stdout.encoding)

    assert 'Unrecognized argument' in output
    assert 'Traceback' not in output