Write End-to-End Tests

When writing end-to-end tests:

1. Identify the user flow to test. Focus on critical paths: signup, login, core feature, checkout.
2. Write the test as the user would experience it: navigate, fill in forms, click buttons, verify results.
3. Use stable selectors: data-testid attributes, ARIA roles, or semantic element queries — not CSS classes or XPaths.
4. Add wait conditions for async operations — don’t use fixed sleep timers.
5. Assert on visible outcomes: text on the page, navigation to a URL, presence of elements.
6. Test one complete flow per test. Don’t chain unrelated flows.
7. Run the test against a clean state. Seed required data before the test, clean up after.