Update how-to-write-tests-for-plugins.md

[123liuziming]

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.86%. Comparing base (8a733b8) to head (45d69ca).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #299   +/-   ##
=======================================
  Coverage   82.86%   82.86%           
=======================================
  Files          24       24           
  Lines        1033     1033           
=======================================
  Hits          856      856           
  Misses        144      144           
  Partials       33       33           

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