Python coverage: experimental first steps

- Add lcov_merger as an attribute to the py_test rule so that it does
  not immediately fall over
- Add a small section to python_stub_template.txt to perform minimal
  setup for coverage integration

I was able to get this to work manually by using a modified version of
coverage.py, see:
https://github.com/nedbat/coveragepy/pull/863

Note that the patch does not work out of the box.

It's basically ~impossible to add integration tests until we get a
working version of coverage.py, but this is the minimum change required
in Bazel to get a basic working version.

Closes #10433.

PiperOrigin-RevId: 291166690
2 files changed
tree: 761c4c09e6958c85859b99bf2f712caf2730a354
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .bazelrc
  9. .gitattributes
  10. .gitignore
  11. AUTHORS
  12. BUILD
  13. CHANGELOG.md
  14. CODEOWNERS
  15. combine_distfiles.py
  16. combine_distfiles_to_tar.sh
  17. compile.sh
  18. CONTRIBUTING.md
  19. CONTRIBUTORS
  20. distdir.bzl
  21. ISSUE_TEMPLATE.md
  22. LICENSE
  23. README.md
  24. WORKSPACE
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