Add more test cases for the upsert API

[shanghaikid]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.33%. Comparing base (99ef054) to head (7d913e7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #403   +/-   ##
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  Coverage   97.33%   97.33%           
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  Files          43       43           
  Lines        2923     2923           
  Branches      724      724           
=======================================
  Hits         2845     2845           
  Misses         78       78           

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