Rename some test classes to avoid spurious warnings

[pont-us]

Fixes #924.

Checklist:

• [ ] Add unit tests and/or doctests in docstrings n/a
• [ ] Add docstrings and API docs for any new/modified user-facing classes and functions n/a
• [ ] New/modified features documented in docs/source/* n/a
• Changes documented in CHANGES.md
• GitHub CI passes
• AppVeyor CI passes
• Test coverage remains or increases (target 100%)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (bb140fb) 93.43% compared to head (24827ed) 93.46%.
Report is 5 commits behind head on master.

❗ Current head 24827ed differs from pull request most recent head 24162d2. Consider uploading reports for the commit 24162d2 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #925      +/-   ##
==========================================
+ Coverage   93.43%   93.46%   +0.02%     
==========================================
  Files         453      453              
  Lines       35518    35518              
==========================================
+ Hits        33188    33196       +8     
+ Misses       2330     2322       -8     

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[forman]

Thanks!