pytest -k doesn't work with "\"? #8982

nguydavi · 2021-08-07T17:03:02Z

nguydavi
Aug 7, 2021

Hey!

I've been trying to use pytest -k passing the name I got by parametrizing my test. For example,

$ pytest -vk 'test_solution[foo.py-5\n10\n-16\n]' validate.py
=========================================================================================================== test session starts ============================================================================================================platform linux -- Python 3.8.10, pytest-6.2.4, py-1.10.0, pluggy-0.13.1 -- /usr/bin/python3
cachedir: .pytest_cache
rootdir: /home/david/foo
collected 4 items

========================================================================================================== no tests ran in 0.01s ===========================================================================================================ERROR: Wrong expression passed to '-k': test_solution[foo.py-5\n10\n-16\n]: at column 23: unexpected character "\"

Note the error message

ERROR: Wrong expression passed to '-k': test_solution[foo.py-5\n10\n-16\n]: at column 23: unexpected character "\"

I tried escaping the \ but that didn't work, the only way I can make it work is to remove the backslashes completely,

$ pytest -vk 'test_solution[foo.py-5 and 10' validate.py

Is \ just not supported by -k ? Or am I missing something ?

Thanks!

Answered by bluetech

Aug 7, 2021

This is probably something we can fix. Can you show the test function code you want to match? The name and parametrization are enough. We could use it as a test case.

View full answer

bluetech · 2021-08-07T17:22:33Z

bluetech
Aug 7, 2021
Maintainer

This is probably something we can fix. Can you show the test function code you want to match? The name and parametrization are enough. We could use it as a test case.

1 reply

nguydavi Aug 7, 2021
Author

Something like this

@pytest.mark.parametrize(
    "param1, param2",
    [
        pytest.param(
            '5\n10\n', '16\n'
        ),
    ],
)
def test_solution(param1, param2):
  pass

Which is then referred by pytest as test_solution[5\n10\n-16\n] . Essentially a new line character \n in the string brings the issue (or any escaped character probably)

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