test(TreeView): add IconTempalte unit test

[ArgoZhang]

Link issues

fixes #8159

Summary By Copilot

Regression?

• Yes
• No

Risk

• High
• Medium
• Low

Verification

• Manual (required)
• Automated

Packaging changes reviewed?

• Yes
• No
• N/A

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• Merge the latest code from the main branch

Summary by Sourcery

Add unit coverage for TreeView icon customization behavior.

Tests:

• Add unit test verifying TreeView respects per-item IconTemplate and suppresses default icons.
• Add unit test verifying TreeView renders SvgIcon correctly when UseSvg, SvgHref, and Icon are configured.

[sourcery-ai]

Reviewer's Guide

Adds unit tests to verify TreeView icon rendering when using custom IconTemplate and SVG-based icons, ensuring correct priority and output structure.

File-Level Changes

Change	Details	Files
Add unit test to verify custom IconTemplate rendering and its precedence over default and SVG icons in TreeView.	Create IconTemplate_Ok test that assigns a custom IconTemplate to the first tree item. Render TreeView with icons enabled and verify the custom template output is present. Assert that when IconTemplate is provided, the rendered HTML contains the custom icon markup and excludes SvgIcon markup.	test/UnitTest/Components/TreeViewTest.cs
Add unit test to verify TreeView renders SVG icons correctly when UseSvg is enabled on a tree item.	Create UseSvg_Ok test that sets UseSvg, SvgHref, and Icon on the first tree item. Render TreeView with icons enabled and retrieve the SvgIcon component from the render tree. Assert that SvgIcon is configured with the expected Name and Href values and that the expected CSS classes and href fragment are rendered.	test/UnitTest/Components/TreeViewTest.cs

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#8159	Add a unit test for the TreeView IconTemplate behavior to verify that a custom icon template is rendered and takes precedence over default/SVG icons.	✅

Possibly linked issues

• test(TreeView): add IconTempalte unit test #8159: The PR adds the IconTemplate unit test in TreeViewTest, directly addressing the issue’s request.
• test(TreeView): add IconTempalte unit test #8159: PR adds TreeView IconTemplate/Svg tests, directly fulfilling the issue’s request for TreeView unit tests.

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[bb-auto]

Auto approved by bb-auto

[sourcery-ai]

Hey - I've left some high level feedback:

• In IconTemplate_Ok, TreeFoo.GetTreeItems() is mutated (setting IconTemplate on items[0]), so if this helper returns a cached/shared collection it could introduce cross-test coupling; consider ensuring a fresh list (e.g., clone or a factory that always returns new instances) before mutating.
• In IconTemplate_Ok you assert the SVG icon is not rendered, but the comment also mentions skipping the default <i> tag; consider explicitly asserting that the default icon element/class is absent to more fully validate the intended precedence behavior.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- In `IconTemplate_Ok`, `TreeFoo.GetTreeItems()` is mutated (setting `IconTemplate` on `items[0]`), so if this helper returns a cached/shared collection it could introduce cross-test coupling; consider ensuring a fresh list (e.g., clone or a factory that always returns new instances) before mutating.
- In `IconTemplate_Ok` you assert the SVG icon is not rendered, but the comment also mentions skipping the default `<i>` tag; consider explicitly asserting that the default icon element/class is absent to more fully validate the intended precedence behavior.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (1da0222) to head (de5be06).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #8160      +/-   ##
===========================================
+ Coverage   99.97%   100.00%   +0.02%     
===========================================
  Files         766       766              
  Lines       34229     34229              
  Branches     4699      4699              
===========================================
+ Hits        34221     34229       +8     
+ Misses          6         0       -6     
+ Partials        2         0       -2     

Flag	Coverage Δ
BB	100.00% <ø> (?)

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