Testing Svelte components ensures your UI behaves as expected. You can test components in isolation (unit tests) or with the full app (integration tests). Popular tools include Vitest, Jest, and Playwright for end-to-end tests.
Unit tests check the functionality of individual components without running the entire app. Use @testing-library/svelte for rendering and interacting with components in tests.
Integration tests verify that multiple components or pages work together as expected. You can render layouts, pages, or even the full app with test frameworks.
E2E tests simulate real user interactions in a browser. Use tools like Playwright or Cypress to test routing, navigation, and server interactions.
Test components in isolation using unit tests whenever possible.
Use
@testing-library/sveltefor a user-focused approach.Mock server responses or stores to isolate tests.
Combine unit, integration, and E2E tests for comprehensive coverage.
Keep tests deterministic and fast; avoid relying on network calls in unit tests.