Jupytext pytest

[mwouts]

Closes #286

[codecov]

Codecov Report

Merging #371 into master will decrease coverage by <.01%.
The diff coverage is 96.92%.

@@            Coverage Diff             @@
##           master     #371      +/-   ##
==========================================
- Coverage   99.05%   99.04%   -0.01%     
==========================================
  Files          74       75       +1     
  Lines        7316     7355      +39     
==========================================
+ Hits         7247     7285      +38     
- Misses         69       70       +1

Impacted Files	Coverage Δ
tests/test_compare.py	100% <ø> (ø)	⬆️
tests/test_cli.py	100% <ø> (ø)	⬆️
jupytext/compare.py	99.34% <100%> (+0.64%)	⬆️
jupytext/formats.py	98.64% <100%> (-0.34%)	⬇️
tests/test_black.py	100% <100%> (ø)	⬆️
tests/test_pytest.py	100% <100%> (ø)
jupytext/cli.py	96.32% <95%> (-0.01%)	⬇️

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