javascript-testing-patterns

Setting up Jest and Vitest for TypeScript involves configuring the test runner to parse TypeScript syntax and establishing the test environment. This Skill provides configuration guidance and code examples to initialize frameworks for JavaScript and TypeScript projects.

Mocking API calls and database dependencies in integration tests is best achieved by isolating components using module mocking and dependency injection. This Skill demonstrates strategies for spying and mocking external integrations to ensure reliable test execution.

Testing React components and hooks with Testing Library involves rendering components and asserting on their output behavior. This Skill provides frontend testing examples covering React component rendering and hook validation using the Testing Library framework.

You can use this Skill for test-driven development in JavaScript as it covers comprehensive TDD patterns. It provides code examples for writing unit, integration, and end-to-end tests to guide your feature development workflow.

Generating coverage reports and using fixtures in Vitest requires configuring the coverage provider and structuring test data setup. This Skill addresses generating coverage reports and implementing fixtures for consistent test data management.