test(Tabs): add test cases

[ccccpj]

🤔 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

fix #734

💡 需求背景和解决方案

📝 更新日志

• other(Tabs): 提升测试覆盖率

• 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

[github-actions]

[github-actions]

Size Change: -125 B (0%)

Total Size: 473 kB

Filename	Size	Change
./dist/tdesign.js	277 kB	-83 B (0%)
./dist/tdesign.min.js	134 kB	-42 B (0%)

ℹ️ View Unchanged

Filename	Size
./dist/reset.css	672 B
./dist/tdesign.css	36.2 kB
./dist/tdesign.min.css	26.1 kB

[github-actions]

Size Change: -126 B (0%)

Total Size: 472 kB

Filename	Size	Change
./dist/tdesign.js	276 kB	-83 B (0%)
./dist/tdesign.min.js	133 kB	-43 B (0%)

ℹ️ View Unchanged

Filename	Size
./dist/reset.css	672 B
./dist/tdesign.css	36.2 kB
./dist/tdesign.min.css	26 kB

[github-actions]

Size Change: -126 B (0%)

Total Size: 472 kB

Filename	Size	Change
./dist/tdesign.js	276 kB	-83 B (0%)
./dist/tdesign.min.js	133 kB	-43 B (0%)

ℹ️ View Unchanged

Filename	Size
./dist/reset.css	672 B
./dist/tdesign.css	36.2 kB
./dist/tdesign.min.css	26 kB