frontend-testing-best-practices

The best way to structure frontend tests is prioritizing End-to-End (E2E) flows over unit tests for user behavior, minimizing complex mocking, and using accessible selectors to ensure long-term maintainability and higher confidence in application quality.

You should avoid unit testing React components directly. Instead, test component behavior within E2E flows to ensure robust validation, reserving unit tests primarily for pure functions rather than isolated component rendering.

Write robust E2E tests with Playwright by using accessible selectors like role, label, and text instead of brittle CSS selectors, ensuring tests target user-facing interactions and remain maintainable during UI refactoring.

Use E2E tests instead of unit tests for most user flow scenarios, especially when extensive mocking is required for unit tests. Rely on unit tests only for pure functions to minimize test maintenance burden.

To minimize mocking in frontend testing, shift towards E2E tests when unit tests require complex mocks. This strategy reduces mock maintenance and provides higher confidence by validating actual user flows and component interactions.