Add unit test for GridToolTip.cs file

[Philip-Wang01]

Related #13442

Proposed changes

• Add unit test file: GridToolTipTests.cs for GridToolTip.cs file.

Microsoft Reviewers: Open in CodeFlow

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.61323%. Comparing base (5821493) to head (f481613).
Report is 23 commits behind head on main.

Additional details and impacted files

@@                 Coverage Diff                  @@
##                main      #13533          +/-   ##
====================================================
+ Coverage   62.21083%   76.61323%   +14.40240%     
====================================================
  Files           3213        3231          +18     
  Lines         638302      639199         +897     
  Branches       47201       47297          +96     
====================================================
+ Hits          397093      489711       +92618     
+ Misses        234153      145922       -88231     
+ Partials        7056        3566        -3490     

Flag	Coverage Δ
Debug	76.61323% <100.00000%> (+14.40240%)	⬆️
integration	18.79411% <ø> (+0.00533%)	⬆️
production	51.03283% <ø> (+32.24405%)	⬆️
test	97.40448% <100.00000%> (+0.00037%)	⬆️
unit	48.41063% <ø> (?)

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[Copilot]

Pull Request Overview

This PR introduces unit tests for the GridToolTip class to verify its functionality with respect to tooltip value setting, handling of null and empty strings, text truncation, resetting behavior, and handle creation.

• Added comprehensive tests covering various tooltip value scenarios
• Integrated handle creation validation through a Form-based test

[Copilot]

[nitpick] The 'GridToolTip_Reset' test expects the tooltip value to remain unchanged after calling Reset(). Consider adding a comment to clarify the intended behavior of Reset() to improve code clarity and maintainability.

[ricardobossan]

Thank you!