Add some tests to increase code coverage

[mikeingold]

I reviewed the Codecov reports and added some tests to provide coverage for some missed lines.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 88.04%. Comparing base (6774801) to head (63edd38). Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #801      +/-   ##
==========================================
+ Coverage   87.74%   88.04%   +0.29%     
==========================================
  Files         164      164              
  Lines        4741     4741              
==========================================
+ Hits         4160     4174      +14     
+ Misses        581      567      -14     

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