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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
If you want even more integration testing MSW is great. It launches a service worker to intercept the requests made by your app, so you can specify a test response. This ways you don't have to mock calls to fetch/axios/your-fetching-library-of-choice and it's closer to end-to-end testing. It comes with trade offs though (additional dependency, learning curve maintenance).
As for the test runner the main player is Jest, but they are others.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.