End-to-end (E2E) testing in SvelteKit verifies that your application works correctly from the user's perspective. It simulates real browser interactions, navigation, and server responses.
Playwright: Modern E2E testing framework for multiple browsers. Supports headless testing, parallel execution, and advanced selectors.
Cypress: Developer-friendly E2E framework with a GUI and time-travel debugging. Great for testing UI and API interactions.
TestCafe: Cross-browser testing framework that requires no browser plugins and works with Node.js.
Puppeteer: Headless Chrome Node API. Good for automated browser testing, but lower-level than Playwright or Cypress.
Run tests against a test or staging environment to avoid affecting production.
Combine E2E tests with unit and integration tests for full coverage.
Use mocking for external APIs to ensure stable tests.
Keep tests deterministic and repeatable.
Automate E2E tests in your CI/CD pipeline for continuous verification.