Testing API
Why Test APIs?
- •Ensures functionality works as expected
- •Prevents regressions when making changes
- •Validates business logic and requirements
- •Improves quality and reliability
- •Serves as documentation of expected behavior
- •Builds confidence in the codebase
Types of API Testing
- •Unit Testing: Testing individual functions or components
- •Integration Testing: Testing API endpoints with their dependencies
- •Functional Testing: Testing complete API workflows
- •Performance Testing: Testing API speed and capacity
- •Security Testing: Testing for vulnerabilities
- •Documentation Testing: Ensuring API docs match implementation
Testing Tools for Node.js
- •Jest: JavaScript testing framework
- •Mocha: Test runner
- •Chai: Assertion library
- •Supertest: HTTP assertions
- •Sinon: Spies, stubs, and mocks
- •Nock: HTTP request mocking
- •Postman: API testing platform
Setting Up Testing Environment
Unit Testing Controllers
Integration Testing API Endpoints
Testing Authentication
Automated Testing with Postman
- •Create collections for different API features
- •Write test scripts using Postman's test framework
- •Use environment variables for dynamic values
- •Run collections via Newman CLI
- •Integrate with CI/CD pipelines
Automated Testing with Postman
Recommended Image
A screenshot showing a successful API test suite in Jest or Postman, with green
checks for passing tests, and coverage reports.
Further Reading
- •[Testing Node.js & Express REST API with Jest and Supertest](https://medium.com/@weblab_tech/how-to-test-a-node-js-api-with-jest-and-supertest-2e5453d12366)
- •[API Testing Best Practices](https://testguild.com/api-testing-best-practices/)
- •[Automated Testing with Postman](https://learning.postman.com/docs/writing-scripts/test-scripts/)
- •[End-to-End API Testing with Supertest](https://www.digitalocean.com/community/tutorials/test-a-node-restful-api-with-mocha-and-chai)