Testing
Snapshot testing is associated with UI components — you render a tree, save it, and fail if it changes. But the same technique works exceptionally well for API responses, and for many teams it's more valuable there than in the UI layer. API responses are structured, deterministic (once you
Testing Strategy
Approval testing is a technique where you test by comparing actual output to a previously "approved" expected output—stored as a file on disk. Instead of writing assert result == "some string", you write Approvals.verify(result) and the framework handles the comparison. The first time a
Testing
Jest snapshot testing is simultaneously the most misused testing feature in the React ecosystem and genuinely useful when applied correctly. Teams either avoid it entirely (too fragile) or over-use it (snapshot everything and update blindly). Neither is right. This guide covers how snapshot testing actually works, when it provides