test: heading level

[StrivingRabbit]

add heading level test

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Please upload report for BASE (main@75bb878). Learn more about missing BASE report.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #38   +/-   ##
=======================================
  Coverage        ?   97.48%           
=======================================
  Files           ?       11           
  Lines           ?      477           
  Branches        ?      137           
=======================================
  Hits            ?      465           
  Misses          ?       10           
  Partials        ?        2           

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