Interface Testing

There are different set of Test Techniques, Test Environment Set up, and Test Approach to test different kind of Intra Module, Inter Module, and External Interface.

Intra Module Interface

Test Technique - White Box
Test Environment - Development Environment
Test Approach - Check for parameter, procedure, database updating etc

Inter Module Interface

Test Technique - Black Box
Test Environment - Isolated Development Environment or CIT Environment
Test Approach - Identify pre and post process to validate interface

External Interface

Test Technique - Black Box
Test Environment - Simulate (Production) Live Environment
Test Approach - Identify interfaces and validate against external system

Next is various Integartion Techniques.