Add pytest-cov plugin

[kelvins]

What is this Python project?

This is a Python plugin to measure and generate reports of code coverage.
It is very simple to use, is MIT licensed and is compatible with coverage package.

What's the difference between this Python project and similar ones?

Compared to coverage the pytest-cov plugin does some extras:

• Subprocess support: you can fork or run stuff in a subprocess and will get covered without any fuss.
• Xdist support: you can use all of pytest-xdist's features and still get coverage.
• Consistent pytest behavior. If you run coverage run -m pytest you will have slightly different sys.path (CWD will be in it, unlike when running pytest).

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[stale]

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