INTERNALERROR: coverage.exceptions.DataError: Can't combine line data with arc data in pytest workflow

[blakeNaccarato]

Looks like what I thought was failing the pytest workflow, an issue with PluggyTeardownRaisedWarning #166, is not actually the issue. Instead, it seems to be the coincident error INTERNALERROR: coverage.exceptions.DataError: Can't combine line data with arc data (see log, a link that will expire eventually), which seems related to coverage, probably because I'm running pytest --cov in CI, but not locally. See pytest-dev/pytest-cov#243 (comment), which points to pytest-dev/pytest-cov#237 (comment), suggesting the following setup.cfg

[coverage:run]
parallel = true

From the Coverage docs, that can be equivalently encoded in pyproject.toml , then combined.

[blakeNaccarato]

Just added a commit enabling parallel. However, this suggests that pytest --cov (as is run in CI) overrides the parallel coverage setting, so could it be something else? This outstanding issue recommends setting config as well.

[blakeNaccarato]

After actually setting the config file properly in 7565276, this is fixed. I will add a comment about the fix in a follow-up commit.