Differences between Interface and Integration Testing.

Testing is crucial in software delivery, as it validates quality and helps developers improve their product. Two important testing types are Integration Testing and Interface Testing. Integration testing verifies that multiple components work together correctly, while interface testing focuses on the communication channels (APIs, web services) between those components.

Integration Testing

Integration testing is performed after unit testing to verify that individual components work correctly when combined in an integrated environment. It tests the end-to-end functionality of all components working together. Integration testing can be done in several approaches − Big Bang (all at once), Top-Down, Bottom-Up, or Sandwich (hybrid).

Interface Testing

Interface testing focuses on testing the communication layer between components − the APIs, web services, connection strings, and other interfaces that allow components to exchange data. It verifies that data is sent and received correctly, error handling works properly, and the interface contract is maintained.

Key Differences

Conclusion

Integration testing verifies that multiple components function correctly together as a system, while interface testing focuses specifically on the communication channels (APIs, web services) between those components. Both are essential − interface testing ensures reliable data exchange, and integration testing confirms the overall system works end-to-end.