Fix mutation tests on push

[danepowell]

Tests are broken in master. In fact, they have been for a while but it wasn't obvious until we updated Infection and it started properly returning a non-zero exit code on these failures: infection/infection#1600

[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (c0bc368) compared to base (628adcb).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff             @@
##              master      #324   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       257       257           
===========================================
  Files             88        88           
  Lines           1690      1690           
===========================================
  Hits            1690      1690           

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