node-tests

What problem does it solve?

Writing reliable tests for Node.js and TypeScript projects can be inconsistent and hard to maintain. This Skill standardizes test structure, mocking strategies, and async handling to improve reliability and collaboration across teams.

Core Features & Use Cases

• Test Structure: Name test files with .test.ts/.test.js; place tests next to code or in a dedicated tests directory; use descriptive test names; use nested describe blocks to organize related tests.
• Effective Mocking: Use jest.mock() for module mocks; use jest.spyOn() for function spies; use mockImplementation() or mockReturnValue() to define mock behavior; reset mocks between tests with afterEach.
• Testing Async Code: Always return promises or use async/await; use resolves/rejects matchers for promises; set appropriate timeouts for slow tests.
• Snapshot Testing: Use snapshot tests for UI components or complex objects that change infrequently; keep snapshots small and focused; review snapshot changes carefully.
• React Component Testing: Prefer React Testing Library over Enzyme; test user behavior and accessibility; query elements by accessibility roles, labels, or text content; use userEvent for realistic interactions.

Quick Start

Run npm test to execute the configured Jest tests for your Node.js/TypeScript project.