Oh of course in your example you are added tests so your diff is only
in the testing code and coverage is not measured there. In that case
you should only look through codecov to see the coverage reported for
the files you were trying to increase the coverage of.
I have found that it is better to do coverage testing locally when
trying to increase coverage because the codecov coverage analysis does
not always update when you push changes to a PR. I would do coverage
testing like (pip install pytest, coverage and pytest-cov):
$ pytest sympy/algebras/ --cov=sympy.algebras.quaternion --cov-report=html
Then open htmlcov/index.html in the browser.
I just did that and the coverage seems to be 99% already.
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