REFACTOR: optimize field plot test

[hui-zhou-a]

Description

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Issue linked

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Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate tests (unit, integration, system).
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved by the PR if any.
• I have agreed with the Contributor License Agreement (CLA).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.34%. Comparing base (0e281d2) to head (86e3791).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6597   +/-   ##
=======================================
  Coverage   82.33%   82.34%           
=======================================
  Files         242      242           
  Lines       76847    76847           
=======================================
+ Hits        63275    63278    +3     
+ Misses      13572    13569    -3     

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