react-testing

React component tests should simulate user interactions and verify observable outcomes using Jest and React Testing Library. This approach prioritizes accessibility-based queries like getByRole to interact with components exactly as users would, ensuring tests remain maintainable.

The Arrange-Act-Assert pattern structures React tests into three phases: setting up the component, performing user actions, and verifying outcomes. This pattern generates user-centric tests that validate observable behavior rather than internal implementation details.

API mocking in React component tests is handled using MSW. This allows you to intercept network requests during testing, ensuring your Jest and React Testing Library tests remain focused on component behavior without relying on real backend services.

Accessibility checks in React component tests are performed using jest-axe. Integrating jest-axe with Jest and React Testing Library verifies that components meet accessibility standards, catching violations during the testing phase rather than in production.

React Testing Library supports Test-Driven Development by allowing you to write user-centric tests before or alongside component development. You define expected user interactions and observable outcomes first, then implement the component to pass those tests.

React component tests break when they query internal implementation details instead of observable behavior. By prioritizing accessibility-based queries like getByRole, tests focus on what users actually see and interact with, making them resilient to internal refactoring.