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✅ Master Level
Integration Testing
Complete Beginner → Advanced Syllabus (Pin-to-Pin)
🟢 LEVEL 1 — Foundations
1. Introduction to Integration Testing
- What is integration testing
- Purpose: verify component interactions
- Integration vs unit testing
- Scope and boundaries
- Pyramid of tests (unit, integration, E2E)
2. Test Types
- Component integration tests
- Service integration tests
- Database integration tests
- API integration tests
🟢 LEVEL 2 — Test Environment Setup
3. Test Database
- Isolated test database
- Schema creation
- Seed data management
- Database cleanup
4. External Services Mocking
- Mock servers
- API mocking tools
- Service mocks
- Response stubbing
🟡 LEVEL 3 — API Integration Tests
5. HTTP Testing
- HTTP client setup
- Request building
- Response validation
- Status codes verification
6. Endpoint Testing
- Multiple endpoints
- Request/response validation
- Error responses
- Status code handling
🟡 LEVEL 4 — Data Flow Testing
7. End-to-End Data Flow
- Request through layers
- Database interactions
- Response building
- Data transformation verification
8. State Management
- State transitions
- Concurrent requests
- State isolation
- State cleanup
🟠 LEVEL 5 — Error Scenarios
9. Failure Mode Testing
- Service timeouts
- Database failures
- Network errors
- Partial failures
10. Recovery Testing
- Retry mechanisms
- Fallback behavior
- Degradation handling
- Error propagation
🟠 LEVEL 6 — Performance & Consistency
11. Performance Integration
- Query performance
- Response time
- Load testing in integration
- Bottleneck identification
12. Data Consistency
- ACID compliance
- Transaction handling
- Cache consistency
- Eventual consistency
🔵 LEVEL 7 — Containerized Services
13. Docker & Containers
- Docker Compose setup
- Service container orchestration
- Network configuration
- Volume management
14. Multi-Service Testing
- Service mesh testing
- Inter-service communication
- Circuit breaker testing
- Service degradation
🔴 LEVEL 8 — Advanced Scenarios
15. Concurrency Testing
- Concurrent requests
- Race condition detection
- Deadlock scenarios
- Load distribution
16. Security Integration
- Authentication flow
- Authorization checks
- CORS testing
- Security header validation
🔴 LEVEL 9 — Governance & Maintenance
17. Test Coverage
- Integration coverage strategy
- Balancing unit vs integration
- Critical path coverage
- Coverage metrics
18. Flakiness & Reliability
- Identifying flaky tests
- Test determinism
- Retry strategies
- Timeout configuration
⭐ Senior Frontend Focus (Must Master)
- Frontend-API integration testing
- Mock API servers for integration
- Network error handling in UI
- Data loading & error states
- Form submission flow testing
- Authentication & authorization flows
- State management with backend integration