Test coverage for TreeView component

[soumyaraju]

Closes #17502

Added tests for TreeView component

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.34%. Comparing base (ad23c63) to head (366078d).
Report is 35 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #18072      +/-   ##
==========================================
+ Coverage   82.14%   82.34%   +0.19%     
==========================================
  Files         404      404              
  Lines       14117    14117              
  Branches     4434     4438       +4     
==========================================
+ Hits        11597    11625      +28     
+ Misses       2359     2330      -29     
- Partials      161      162       +1     

☔ View full report in Codecov by Sentry.
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[emyarod]

looks good to me!

[guidari]

Hey @soumyaraju Thanks for opening that!
I noticed the test it 74.48%, is there any reason why those lines weren't tested?