E2E Testing: The Final Check, Not The Whole Strategy
E2E testing is a dress rehearsal for your app, simulating a full user journey. Use it sparingly for critical flows like checkout, as it tests all services together. The footgun is over-reliance: they are slow, brittle, and hard to debug.
End-to-end testing acts as a final dress rehearsal, simulating a complete user journey from the UI to the database to verify the entire system works in concert. It's best used sparingly for mission-critical paths, like a full purchase flow in an e-commerce app. The primary footgun is making E2E tests your main strategy; their slowness, brittleness, and debugging difficulty mean most issues should be caught earlier with faster component or integration tests.
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