Testing Strategies for System Integration Projects
Integration projects connect multiple systems. Testing ensures data flows correctly, APIs respond, and edge cases are handled. Here's how to test system integrations.
Table of Contents
API Testing
Test each API: status codes, response shape, error handling. Use Postman, REST Assured, or pytest. Mock external APIs in unit tests; use sandbox for integration.
End-to-End Flows
Test full flow: create in System A, verify in System B. Sync, transform, idempotency. See our E2E Testing guide.
Data Validation
Validate field mapping, data types, null handling. Compare source and target. Test edge cases: duplicates, large payloads, special characters.
Test Environments
Staging with sandbox/mock integrations. Avoid testing against production. Use anonymized or synthetic data.
Frequently Asked Questions
How do we test with systems we don't control?
Use sandbox/staging from vendor when available. Otherwise mock the API. Contract testing (Pact) validates both sides agree on the interface.