Increase code coverage for multiselect component

[soumyaraju]

Closes #17480

Added test cases for improving code coverage of multiselect

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.26%. Comparing base (f2ba3fd) to head (ea5d29c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #18146      +/-   ##
==========================================
+ Coverage   83.22%   83.26%   +0.04%     
==========================================
  Files         404      404              
  Lines       14338    14338              
  Branches     4645     4645              
==========================================
+ Hits        11933    11939       +6     
+ Misses       2243     2237       -6     
  Partials      162      162              

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[Gururajj77]

Hi @soumyaraju , if possible could you please write more tests??

[soumyaraju]

Hi @Gururajj77, i have added few more tests, could you check?