Test Patterns

Write, run, and debug tests across languages. Covers unit tests, integration tests, E2E tests, mocking, coverage, and TDD workflows.

When to Use

• Setting up a test suite for a new project
• Writing unit tests for functions or modules
• Writing integration tests for APIs or database interactions
• Setting up code coverage measurement
• Mocking external dependencies (APIs, databases, file system)
• Debugging flaky or failing tests
• Implementing test-driven development (TDD)

Node.js (Jest / Vitest)

Setup