What's the expected dev/test environment?

[chrisinmtown]

I'm trying to use MacOS as the dev/test environment for Connexion. I used brew to install Python versions 3.8 .. 3.12 which are the versions listed in tox.ini. When I run tox it blows up almost immediately due to a difference in the behavior of Linux sed vs MacOS sed. (FWIW I opened a tiny PR for that with a solution that should work on both.) Even with that fix in place, I see some test failures that I cannot yet explain, wondering if it's another environment thing. Here's one of the failures:

FAILED tests/api/test_parameters.py::test_array_query_param[openapi.yaml-AsyncApp] - AssertionError: assert ['1'] == ['1;2;3']

If someone would please explain the dev/test environment, I will work up another tiny PR for the project README. Thanks in advance.