Best Frontend Testing System?

For my NextJS app what is the BEST software out there for a small freelance team to create tests for our clients projects so as we develop we ensure each input, form, page, drawer, etc have the info and function as they need.

Bonus if it connects to github to pass / fail pull requests based on those tests.

Also we will be using Vercel for hosting on most if not all platforms if that info is helpful.

What do you guys recommend?
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