test coverage

[sbryngelson]

improve codecov with gcovr

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 39.94%. Comparing base (fe87fc5) to head (f189288).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #994      +/-   ##
==========================================
- Coverage   40.92%   39.94%   -0.98%     
==========================================
  Files          70       70              
  Lines       20299    21986    +1687     
  Branches     2521    14174   +11653     
==========================================
+ Hits         8307     8782     +475     
+ Misses      10454     6182    -4272     
- Partials     1538     7022    +5484     

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