API Testing Expert knowledge for testing HTTP APIs with Supertest (TypeScript/JavaScript) and httpx/pytest (Python). TypeScript/JavaScript (Supertest) Installation Basic Setup Request Methods Headers and Query Parameters Authentication Testing Error Handling Python (httpx + pytest) Installation Basic Setup Fixtures File Upload GraphQL Testing Performance Testing Best Practices - Group related endpoints in blocks - Reset database between tests - Validate status codes first - Check response structure - Test error message format - Mock external services - Test both happy path and error cases See…