Add unit tests for ToolStripAdornerWindowService

[Nora-Zhou01]

Related #10773

Proposed changes

• Add unit test ToolStripAdornerWindowServiceTests.cs for public properties and method of the ToolStripAdornerWindowService

Microsoft Reviewers: Open in CodeFlow

[codecov]

Codecov Report

Attention: Patch coverage is 90.65421% with 10 lines in your changes missing coverage. Please review.

Project coverage is 61.32004%. Comparing base (e91e3bc) to head (36a5dd1).
Report is 369 commits behind head on main.

Additional details and impacted files

@@                 Coverage Diff                  @@
##                main      #13029          +/-   ##
====================================================
- Coverage   75.75455%   61.32004%   -14.43451%     
====================================================
  Files           3159        1525        -1634     
  Lines         635942      158025      -477917     
  Branches       46987       14712       -32275     
====================================================
- Hits          481755       96901      -384854     
+ Misses        150726       60434       -90292     
+ Partials        3461         690        -2771     

Flag	Coverage Δ
Debug	61.32004% <90.65421%> (-14.43451%)	⬇️
integration	10.64420% <ø> (-7.53058%)	⬇️
production	39.09191% <ø> (-10.22564%)	⬇️
test	95.66737% <90.65421%> (-1.37770%)	⬇️
unit	36.50795% <ø> (-10.02375%)	⬇️

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[Copilot]

PR Overview

This pull request adds unit tests for the ToolStripAdornerWindowService to validate its public properties and methods along with enabling nullability in the tests.

• Introduces multiple tests covering graphics, coordinate translation, and resource disposal.
• Provides STA-thread execution for tests that interact with UI components.

Reviewed Changes

File	Description
src/System.Windows.Forms.Design/tests/UnitTests/System/Windows/Forms/Design/ToolStripAdornerWindowServiceTests.cs	Contains new unit tests for verifying ToolStripAdornerWindowService behavior and proper handling of designer overlays and graphics.

Copilot reviewed 1 out of 1 changed files in this pull request and generated 1 comment.

[ricardobossan]

Thank you!

New comments need to be addressed

[ricardobossan]

Thank you!