test(Rate): enhance the API test coverage of the Rate component (#5802)

* test: enhance the API test coverage of the Rate component

Enhance the API test coverage of the Rate component

closed #5631

* test(unit): rate test enhance

* test(unit): optimization

* test(unit): getBoundingClientRect

* chore(rate): lint

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Co-authored-by: zhangpaopao <[email protected]>

Author: johnj2711