Use pytest to generate junit xml files for python tests

[azeey]

🦟 Bug fix

Summary

Python unit tests currently don't generate junit xml files for consumption by Jenkins. This results in Jenkins indicating that there are no failing tests when python tests are failing. couldn't find a way to generate these files using the builtin unittest python library, so I have added a dependency on pytest. If pytest is not available, a CMake warning is emitted.

Checklist

• Signed all commits for DCO
• Added tests
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov]

Codecov Report

Merging #1063 (6612e0b) into main (d3fde45) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1063   +/-   ##
=======================================
  Coverage   83.39%   83.39%           
=======================================
  Files         151      151           
  Lines       18490    18490           
=======================================
  Hits        15419    15419           
  Misses       3071     3071           

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[scpeters]

looks good, and I think we could follow up by adding pytest to the following line to enable junit output for homebrew builds

• https://github.com/gazebo-tooling/release-tools/blob/master/jenkins-scripts/sdformat-default-devel-homebrew-amd64.bash#L7

[azeey]

looks good, and I think we could follow up by adding pytest to the following line to enable junit output for homebrew builds

• https://github.com/gazebo-tooling/release-tools/blob/master/jenkins-scripts/sdformat-default-devel-homebrew-amd64.bash#L7

Thanks for pointing me to that! I wasn't sure what to do after I saw that it wasn't possible to install pytest from homebrew.