Testing and Tooling (1/5)
How do you test Svelte components?

    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.

    Example: Counter Component Test

    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.

    Example: Testing a Page

    E2E tests simulate real user interactions in a browser. Use tools like **Playwright** or **Cypress** to test routing, navigation, and server interactions.

    Example: Playwright Test
    Tips for testing Svelte components:
    • Test components in isolation using unit tests whenever possible.
    • Use `@testing-library/svelte` for 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.