Review GraphSon tests

[danielcweber]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.34%. Comparing base (82a3bad) to head (61162cf).
Report is 66 commits behind head on 12.x.

Additional details and impacted files

@@            Coverage Diff             @@
##             12.x    #1781      +/-   ##
==========================================
+ Coverage   83.22%   83.34%   +0.11%     
==========================================
  Files         252      252              
  Lines        6825     6826       +1     
  Branches     1486     1486              
==========================================
+ Hits         5680     5689       +9     
+ Misses        505      500       -5     
+ Partials      640      637       -3     

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