Why throttle the network when testing a React UI?
Because a UI that works on fast Wi-Fi can be unusable on slow 3G. Throttle the network and test under realistic conditions, since many users will visit on slow or unstable connections that your fast dev network hides.
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More FAQs in Testing a React UI Before Release: What to Cover
All three states (loading, error, success), empty and edge cases, responsive behavior on real devices, auth flows, real-time features, keyboard and screen reader accessibility, and performance on throttled slow networks.
Because empty results, very long inputs, very long lists, and boundary values are where bugs hide. These are also where users suffer most when things go wrong, so testing them is high-value.
Because auth bugs in production are serious and hard to recover from. Test signup, signin, signout, protected route access, and persistence across reloads, ideally on the deployed app, since auth has production-specific concerns like authorized domains.
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