Add unit test for TrackBar

[Syareel-Sukeri]

Related #10453

Proposed changes

• Add unit tests for TrackBar to test its events: AutoSizeChanged and Paints.

Customer Impact

• None

Regression?

• No

Risk

• Minimal

Test methodology

• Unit tests

Microsoft Reviewers: Open in CodeFlow

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.36326%. Comparing base (fccada2) to head (6b0ef44).
Report is 19 commits behind head on main.

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main      #11066         +/-   ##
===================================================
- Coverage   73.36695%   73.36326%   -0.00370%     
===================================================
  Files           3094        3099          +5     
  Lines         632406      632844        +438     
  Branches       46857       46880         +23     
===================================================
+ Hits          463977      464275        +298     
- Misses        164981      165101        +120     
- Partials        3448        3468         +20     

Flag	Coverage Δ
Debug	73.36326% <100.00000%> (-0.00370%)	⬇️
integration	18.28130% <ø> (-0.16675%)	⬇️
production	46.80376% <ø> (-0.05556%)	⬇️
test	94.98443% <100.00000%> (+0.00132%)	⬆️
unit	43.84978% <ø> (+0.08026%)	⬆️

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[Tanya-Solyanik]

@Syareel-Sukeri - we had recently enabled multiple analyzers in this repo, please update your change to follow these new rules. You will see warning and error when you build your branch in the VisualStudio after rebasing your branch on the latest main. Resolve these warnings and errors by clicking on the "code-fix" icons - light bulbs.

[lonitra]

LGTM