backend-testinglisted

# Backend Testing ## When to use this skill Specific situations that should trigger this skill: - **New feature development**: Write tests first using TDD (Test-Driven Development) - **Adding API endpoints**: Test success and failure cases for REST APIs - **Bug fixes**: Add tests to prevent regressions - **Before refactoring**: Write tests that guarantee existing behavior - **CI/CD setup**: Build automated test pipelines ## Input Format Format and required/optional information to collect from the user: ### Required information - **Framework**: Express, Django, FastAPI, Spring Boot, etc. - **Test tool**: Jest, Pytest, Mocha/Chai, JUnit, etc. - **Test target**: API endpoints, business logic, DB operations, etc. ### Optional information - **Database**: PostgreSQL, MySQL, MongoDB (default: in-memory DB) - **Mocking library**: jest.mock, sinon, unittest.mock (default: framework built-in) - **Coverage target**: 80%, 90%, etc. (default: 80%) - **E2E tool**: Supertest, TestClient, RestAssured (optional) ### Input example ``` Test the user authentication endpoints for an Express.js API: - Framework: Express + TypeScript - Test tool: Jest + Supertest - Target: POST /auth/register, POST /auth/login - DB: PostgreSQL (in-memory for tests) - Coverage: 90% or above ``` ## Instructions Step-by-step task order to follow precisely. ### Step 1: Set up the test environment Install and configure the test framework and tools. **Tasks**: - Install test libraries - Configure test data