One of possibilities how to live without unittest2.

Codecov Report

Merging #50 into master will increase coverage by 1.12%. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master       #50      +/-   ##
===========================================
+ Coverage   98.87%   100.00%   +1.12%     
===========================================
  Files           1         1              
  Lines          89        88       -1     
  Branches       18        18              
===========================================
  Hits           88        88              
+ Misses          1         0       -1     

Impacted Files	Coverage Δ
deprecation.py	100.00% <100.00%> (+1.12%)	:arrow_up:

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unittest2 is still always being imported because it's currently a part of test-requirements.txt. I think if you want this change to be fully effective we probably need to pull it out of test-requirements and then add testenvs in tox.ini for the versions that do need unittest2, that way the 2.7 tests run with unittest2 and the later 3.x run with regular unittest.

Something like that? Not much familiar with tox, sorry.