Add unit test for RadioButtonStandardAdapter.cs, RadioButtonPopupAdapter.cs and RadioButtonFlatAdapter.cs files

[Olina-Zhang]

Related #13442

Proposed changes

• Add unit test file: RadioButtonStandardAdapterTests.cs for RadioButtonStandardAdapter.cs file.
• Add unit test file: RadioButtonPopupAdapterTests.cs for RadioButtonPopupAdapter.cs file.
• Add unit test file: RadioButtonFlatAdapterTests.cs for RadioButtonFlatAdapter.cs file

[Copilot]

Pull Request Overview

This PR adds a new unit test file for RadioButtonStandardAdapter, verifying its rendering methods for various RadioButton appearance settings.

• Adds tests for PaintUp, PaintDown, and PaintOver methods under different control appearances
• Covers both Appearance.Button and Appearance.Normal cases

Comments suppressed due to low confidence (2)

src/test/unit/System.Windows.Forms/System/Windows/Forms/RadioButtonStandardAdapterTests.cs:72

• [nitpick] The test method name 'PaintDown_AppearanceNormal_CallsPaintUp' may be misleading. If the intended behavior is for PaintDown to internally delegate to PaintUp on Appearance.Normal, consider clarifying the method name or adding a comment to explain this behavior.

public void PaintDown_AppearanceNormal_CallsPaintUp()

src/test/unit/System.Windows.Forms/System/Windows/Forms/RadioButtonStandardAdapterTests.cs:25

• [nitpick] Currently, the tests only verify that the control properties remain unchanged after the painting call. Consider adding assertions or additional verifications (such as inspecting the bitmap or using a graphics mock) to ensure that the adapter’s painting logic executes as expected.

adapter.PaintUp(e, CheckState.Checked);

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.13003%. Comparing base (5821493) to head (3c7a751).
Report is 2 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (5821493) and HEAD (3c7a751). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (5821493)	HEAD (3c7a751)
test	1	0

Additional details and impacted files

@@                 Coverage Diff                  @@
##                main      #13456          +/-   ##
====================================================
- Coverage   62.21083%   51.13003%   -11.08081%     
====================================================
  Files           3213        2054        -1159     
  Lines         638302      286540      -351762     
  Branches       47201       41933        -5268     
====================================================
- Hits          397093      146508      -250585     
+ Misses        234153      137221       -96932     
+ Partials        7056        2811        -4245     

Flag	Coverage Δ
Debug	51.13003% <ø> (-11.08081%)	⬇️
integration	18.78668% <ø> (-0.00210%)	⬇️
production	51.13003% <ø> (+32.34125%)	⬆️
test	?
unit	48.51120% <ø> (?)

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[KlausLoeffelmann]

Hey Olina,

let's please wait with unit tests for Button- and ToolStripRenderers, until the DarkMode changes are ready.

We would need to take a closer look anyway, since there are a few things, I need to investigate, which may have been regressed in the past.

I'll follow up!