Beyond React Testing Library: Testing React Libraries (and library-like code)

" summary

Covers limitations of Testing Library for library code and explains how Apollo Client uses the React Profiler to produce a stream of render events for stream-based testing of render counts, order of DOM changes, Suspense behavior (including suspended vs committed renders), and rerender detection. Describes a released library implementing this approach and also addresses testing library code across environments—React Server Components, streaming SSR, and the Browser—including verifying exports fields and rendering components in isolation for those targets.

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