PyTest Coverage Warning When Importing OpenCV

This issue is a continuation of this issue from coveragepy as the issue was closed because a workaround was found. This workaround still works, but the root problem still exists so I wanted to document it on this repo.

Expected behaviour

I would expect there to be no warnings.

Actual behaviour

The following warnings are thrown:

CoverageWarning: Couldn't parse '/home/mvine/Documents/test_coverage/config-3.py': No source for code: '/home/mvine/Documents/test_coverage/config-3.py'. (couldnt-parse)
Couldn't parse '/home/mvine/Documents/test_coverage/config.py': No source for code: '/home/mvine/Documents/test_coverage/config.py'. (couldnt-parse)

Steps to reproduce

This comment on this issue precisely demonstrates the steps to reproduce: https://github.com/nedbat/coveragepy/issues/1653#issuecomment-1653675347

Although there are several different ways to achieve this bug (such as running pytest --cov).

Issue submission checklist

• This is not a generic OpenCV usage question (looking for help for coding, other usage questions, homework etc.)
• I have read the README of this repository and understand that this repository provides only an automated build toolchain for OpenCV Python packages (there is no actual OpenCV code here)
• The issue is related to the build scripts in this repository, to the pre-built binaries or is a feature request (such as "please enable this additional dependency")
• I'm using the latest version of opencv-python - opencv-python==4.10.0.84

Start by reproducing the linked coveragepy issue and the reported pytest --cov path with opencv-python==4.10.0.84. Determine whether the warning originates in this repository's build or test tooling, then verify that the reproduction completes without the reported CoverageWarning messages.