javascript-testing-patterns

To set up Jest and Vitest for TypeScript, you need to install the testing frameworks and create a configuration file. This Skill provides framework setup demonstrations and configuration examples for both Jest and Vitest in JavaScript and TypeScript applications.

The best way to mock external API calls in JavaScript testing is using module mocking and dependency injection. This Skill illustrates these mocking patterns to isolate functions, classes, and asynchronous operations during unit testing.

To write integration tests for backend API endpoints, you combine testing frameworks with database integration patterns. This Skill provides examples for setting up API and database integration tests to ensure backend code quality and reliability.

Yes, you can use Testing Library to test React custom hooks and components. This Skill includes specific frontend testing patterns that demonstrate how to validate component behavior and hook logic effectively.

Test-driven development works seamlessly with JavaScript testing frameworks like Jest and Vitest. This Skill covers TDD workflows, providing practical examples to guide your development process from failing tests to implementation.

Testing fixtures and factories in JavaScript are used to generate consistent test data and simplify test utilities. This Skill shows how to use these tools, alongside snapshot testing, to manage complex data structures across unit and integration tests.