Continuing from #1530 (reply in thread)

It seems that pytest defaults to 'prepend' import mode, meaning that for a source tree without a /src folder, like this

• mymodule
  • __init__.py
  • main.py
  • extension.c
• tests
  • test_main.py

Even when invoked as cibuildwheel does, with the wheel installed in a venv, with cwd as a random temp dir, the mymodule folder in the source tree is higher in the import order than the installed wheel.

This is a pity, the intention of changing the cwd during the test-command was to prevent this problem. I'm trying to think if there's a way that cibuildwheel can work around this...? Obviously the /src structure is best, but we can't mandate that for all cibuildwheel projects.

Another thing that I do wonder is if it's even worth changing the cwd for the test-command given this pytest default - it's a common gotcha within cibuildwheel, and if the above is universally true it's not even helping...!