[Backend]Test player creation/update

[johanah29]

#1490

[RomuDeuxfois]

Can you take care of upsertPlayer as well ? thx

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.47%. Comparing base (552196f) to head (b46f0a0).
Report is 3 commits behind head on release/1.11.0.

Additional details and impacted files

@@                 Coverage Diff                  @@
##             release/1.11.0    #2139      +/-   ##
====================================================
+ Coverage             35.98%   36.47%   +0.48%     
- Complexity             1487     1501      +14     
====================================================
  Files                   546      546              
  Lines                 16626    16626              
  Branches               1061     1061              
====================================================
+ Hits                   5983     6064      +81     
+ Misses                10340    10253      -87     
- Partials                303      309       +6     

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[antoinemzs]

Good coverage, however we seem to not validate bevhaviour on invalid inputs (e.g. HTTP 400). Could do with a small test case? Or is it validated as a blanket error somewhere else? (i.e. as a generic deserialisation error code)