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Python coverage: experimental first steps #10433

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@ulfjack ulfjack commented Dec 17, 2019

  • 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:
nedbat/coveragepy#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.

- 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:
nedbat/coveragepy#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.
@jin jin added the team-Rules-Python Native rules for Python label Dec 20, 2019
@ulfjack ulfjack closed this Jan 22, 2020
@ulfjack ulfjack deleted the py-coverage branch January 22, 2020 10:46
bazel-io pushed a commit that referenced this pull request Jan 23, 2020
- 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:
nedbat/coveragepy#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
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