completed tests for nested select. modified code to handle test cases.

[benbarn313]

Complete tests for nested_select

[hoxbro]

pre-commit.ci autofix

[hoxbro]

You need to merge the latest main into the branch to get the package to build.

[hoxbro]

pre-commit.ci autofix

[codecov]

Codecov Report

Attention: 154 lines in your changes are missing coverage. Please review.

Comparison is base (41d6b4f) 38.38% compared to head (9427768) 38.29%.
Report is 9 commits behind head on add_nested_select.

Files	Patch %	Lines
panel/widgets/select.py	14.06%	110 Missing ⚠️
panel/tests/widgets/test_select.py	13.72%	44 Missing ⚠️

Additional details and impacted files

@@                  Coverage Diff                  @@
##           add_nested_select    #5925      +/-   ##
=====================================================
- Coverage              38.38%   38.29%   -0.09%     
=====================================================
  Files                    291      291              
  Lines                  42894    43073     +179     
=====================================================
+ Hits                   16465    16495      +30     
- Misses                 26429    26578     +149     

Flag	Coverage Δ
ui-tests	38.29% <13.96%> (-0.09%)	⬇️

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[ahuang11]

Will add reference gallery in my branch.