strange handling of test ids for parametrize

[graingert]

$ cat tests/test_toast.py
import pytest

@pytest.mark.parametrize(
    "ham,spam",
    [
        ("/bacon/../", u"//bacon/../"),
        ("/bacon/../../", u"//bacon/../../"),
        ("/bacon//", u"//bacon//"),
    ],
)
def test_eggs(ham,spam):
    pass
$ pytest -vvv tests/test_eggs.py
==================================== test session starts ====================================
platform linux -- Python 3.7.5, pytest-5.3.2, py-1.8.0, pluggy-0.12.0 -- /home/graingert/.virtualenvs/pytest/bin/python3.7
cachedir: .pytest_cache
rootdir: /home/graingert/projects/sausage/tests, inifile: pytest.ini
collected 3 items                                                                           

tests/test_toast.py::test_eggs[/-/] PASSED                                            [ 33%]
tests/] PASSED                                                                        [ 66%]
tests/test_toast.py::test_eggs[/bacon/-/bacon/] PASSED                                [100%]

===================================== 3 passed in 0.01s =====================================

• [x] a detailed description of the bug or suggestion
• [ ] output of pip list from the virtual environment you are using
• [x] pytest and operating system versions
• [x] minimal example if possible

[graingert]

of particular concern is ("/bacon/../../", u"//bacon/../../") -> tests/] PASSED

[graingert]

this also happens on pytest==4.6.5

[Zac-HD]

FYI you can syntax-highlight code blocks.

Not sure what's happening here but I agree it's not good!

[graingert]

FYI you can syntax-highlight code blocks.

I know but GitHub bash syntax highlighting is not smart enough to detect cat and file extensions

[asottile]

if you use

    ```console
    $ foo
    bar

it will highlight as

```console
$ foo
bar

[blueyed]

@graingert Not sure what the problem here is, but it looks like this for me, i.e. the params are joined using "-" (which appears to not be the case for you I guess?):

============================= test session starts ==============================
platform linux -- Python 3.8.1, pytest-5.3.3.dev46+g83ba709c4.d20200112, py-1.8.1, pluggy-0.13.2.dev5+g76838b1 -- …/Vcs/pytest/.venv/bin/python
cachedir: .pytest_cache
hypothesis profile 'default' -> database=DirectoryBasedExampleDatabase('…/Vcs/pytest/.hypothesis/examples')
rootdir: …/Vcs/pytest, inifile: tox.ini
plugins: hypothesis-5.1.2
collecting ... collected 3 items

t/t_param.py::test_eggs[/bacon/../-//bacon/../] PASSED                   [ 33%]
t/t_param.py::test_eggs[/bacon/../../-//bacon/../../] PASSED             [ 66%]
t/t_param.py::test_eggs[/bacon//-//bacon//] PASSED                       [100%]

============================== 3 passed in 0.03s ===============================

[blueyed]

You have

cat tests/test_toast.py

and

pytest -vvv tests/test_eggs.py

Are symlinks involved maybe?

[blueyed]

I can reproduce it after touch tests/pytest.ini / touch t/pytest.ini.. :+1:

[graingert]

@blueyed reproduction as xfail test here: https://github.com/pytest-dev/pytest/pull/6394