test: move test cases to testing lib for Transfer

[LiHaoGit]

[中文版模板 / Chinese template]

🤔 This is a ...

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

🔗 Related issue link

#34087

• Component: Transfer

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	move test cases to testing lib for Transfer
🇨🇳 Chinese

☑️ 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
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

[github-actions]

[codecov]

Codecov Report

Merging #37029 (aca6668) into master (956d332) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master    #37029   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          437       437           
  Lines         8037      8037           
  Branches      2420      2420           
=========================================
  Hits          8037      8037           

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[MadCcc]

多了空行？