Mark tests for sign that do not behave as expected as _broken

[kimikage]

cf. #356

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.22%. Comparing base (a9e0ed3) to head (08e3f76).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #359   +/-   ##
=======================================
  Coverage   97.22%   97.22%           
=======================================
  Files           7        7           
  Lines         792      792           
=======================================
  Hits          770      770           
  Misses         22       22           

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