bdc527c spec: add pytest-cov BR

Authored and Committed by kparal a year ago
    spec: add pytest-cov BR
    The build process was failing because `pytest --cov*` arguments are unknown when
    the `pytest-cov` plugin is not installed. This will make the build process
    understand the `--cov*` args. It will not measure test coverage, so this has no
    performance impact.
file modified
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