test(module: core): Add unit tests

[LeaFrock]

🤔 This is a ...

• New feature
• Bug fix
• Site / documentation update
• Demo update
• Component style update
• Bundle size optimization
• Performance optimization
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Other (about what?)

🔗 Related issue link

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	Improve unit tests cover for core module
🇨🇳 Chinese	增加核心模块的单元测试覆盖

☑️ 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
• Changelog is provided or not needed

[github-actions]

[LeaFrock]

Failed AntDesign.Tests.button.ButtonTests.Button_animation_when_cliked_end_after_some_time

I don't know why the CI fails. All tests work well in my local environment. I need your check for it, thanks! @ElderJames

[codecov]

Codecov Report

Base: 42.55% // Head: 41.25% // Decreases project coverage by -1.30% ⚠️

Coverage data is based on head (a0058ba) compared to base (75d108e).
Patch coverage: 41.86% of modified lines in pull request are covered.

❗ Current head a0058ba differs from pull request most recent head 743dadd. Consider uploading reports for the commit 743dadd to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2821      +/-   ##
==========================================
- Coverage   42.55%   41.25%   -1.31%     
==========================================
  Files         544      544              
  Lines       25742    25763      +21     
  Branches      260      260              
==========================================
- Hits        10955    10628     -327     
- Misses      14747    15095     +348     
  Partials       40       40              

Impacted Files	Coverage Δ
components/core/Helpers/ComponentBaseExtensions.cs	0.00% <0.00%> (ø)
components/core/Helpers/JsonElementHelper.cs	0.00% <0.00%> (ø)
components/core/Helpers/MomentHelper.cs	100.00% <ø> (+100.00%)	⬆️
components/table/Column.razor.cs	0.00% <0.00%> (ø)
components/core/Helpers/THelper.cs	27.02% <5.88%> (-12.98%)	⬇️
components/core/Helpers/ClassMapper.cs	95.00% <90.90%> (+1.25%)	⬆️
components/core/Helpers/ColorHelper.cs	100.00% <100.00%> (ø)
components/core/Helpers/EnumHelper.cs	100.00% <100.00%> (+20.83%)	⬆️
components/list/ListItemLayout.cs	0.00% <0.00%> (-100.00%)	⬇️
components/list/ListItem.razor	0.00% <0.00%> (-95.31%)	⬇️
... and 25 more

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[ElderJames]

LGTM. It help a lot!