Supplemental 4: Integration Testing (Slides)
Overview
This lesson explores integration testing—verifying that multiple components of your application work together correctly, going beyond unit tests to catch real-world issues.
Topics Covered
Understanding Integration Tests
- Difference between unit tests and integration tests
- Why integration tests are essential
- Common bugs that only integration tests catch
Types of Integration Tests
- API Testing: Testing HTTP endpoints and responses
- Database Testing: Verifying data persistence and queries
- UI Testing: Testing user interactions in browsers
- End-to-End Testing: Testing complete user workflows
- Backend: SuperTest, REST Assured, Postman
- Database: TestContainers, in-memory databases
- Frontend: Playwright, Cypress, Selenium
- Mocking: WireMock, Mock Service Worker (MSW)
Best Practices
- Test realistic scenarios
- Use test databases and environments
- Balance speed vs. coverage
- Implement continuous integration (CI)
Additional Resources
Testing Frameworks
- Playwright - Modern browser automation
- Cypress - JavaScript end-to-end testing
- Jest - JavaScript testing framework
- JUnit - Java testing framework
- SuperTest - HTTP assertion library
Learning Resources