coverage.misc.CoverageException: Couldn't use data file: Safety level may not be changed inside a transaction

Hello and thank you for your work on this project.

A possible incompatibility between pytest-cov and coverage versions greater than 5.0.0 is causing tests to fail in my company’s projects. To resolve this problem, our team has pinned coverage to version 4.4 in test-requirements.txt.

After cloning this repo, I noticed that tests are failing when I run them locally and the coverage50 env is set. Have you witnessed this error before and is it possible that coverage ought to be pinned down to < 5.0.0 in the requirements file here?

[patti-c]

@nedbat - Thank you for your response! The command I ran that fails is tox -e py3-pytest52-xdist30-coverage50 on master in pytest-cov. When I run these tests, I see the same error on each failed test that I see in my own projects when attepting to run tox, which is to say:

E           and: 'INTERNALERROR>   File "/Users/patriciacarter/development/pytest-cov/.tox/py3-pytest52-xdist30-coverage50/lib/python3.6/site-packages/coverage/sqldata.py", line 1025, in execute'
E           and: 'INTERNALERROR>     return self.con.execute(sql, parameters)'
E           and: 'INTERNALERROR> sqlite3.OperationalError: Safety level may not be changed inside a transaction'

[nedbat]

@patti-c Coverage 5.0 is new, and we are working out the problems. We are not going to pin coverage in pytest-cov, instead we will be trying to fix the problems in coverage.

Can you give us instructions for reproducing the problem? What repo are you running, at which commit, and what commands are you running to see the problem?