test(collapse): add unit test for collapse and support content api

[isanxia]

🤔 这个 PR 的性质是？

• 日常 bug 修复
• 新特性提交
• 文档改进
• 演示代码改进
• 组件样式/交互改进
• CI/CD 改进
• 重构
• 代码风格优化
• 测试用例
• 分支合并
• 其他

🔗 相关 Issue

#1418

💡 需求背景和解决方案

📝 更新日志

• test(collapse): add unit test for collapse and support content api

• 本条 PR 不需要纳入 Changelog

☑️ 请求合并前的自查清单

⚠️ 请自检并全部勾选全部选项。⚠️

• 文档已补充或无须补充
• 代码演示已提供或无须提供
• TypeScript 定义已补充或无须补充
• Changelog 已提供或无须提供

[codecov-commenter]

Codecov Report

Merging #1536 (ce7d993) into develop (492d477) will increase coverage by 4.05%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #1536      +/-   ##
===========================================
+ Coverage    57.94%   62.00%   +4.05%     
===========================================
  Files          407      655     +248     
  Lines        15371    15835     +464     
  Branches      2931     2826     -105     
===========================================
+ Hits          8907     9818     +911     
+ Misses        6187     5729     -458     
- Partials       277      288      +11     

Impacted Files	Coverage Δ
src/range-input/range-input-popup-props.ts	25.00% <0.00%> (-75.00%)	⬇️
src/grid/row-props.ts	71.42% <0.00%> (-28.58%)	⬇️
src/select/util.ts	65.00% <0.00%> (-26.67%)	⬇️
src/select/props.ts	54.54% <0.00%> (-20.46%)	⬇️
src/date-picker/props.ts	53.84% <0.00%> (-16.16%)	⬇️
src/date-picker/date-range-picker-props.ts	42.85% <0.00%> (-11.69%)	⬇️
src/select/optionGroup.tsx	31.57% <0.00%> (-9.60%)	⬇️
src/cascader/props.ts	55.55% <0.00%> (-8.74%)	⬇️
src/upload/dragger.tsx	27.27% <0.00%> (-7.51%)	⬇️
src/cascader/cascader.tsx	56.89% <0.00%> (-7.11%)	⬇️
... and 442 more

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