What is system integration testing (SIT)?

System Integration Testing (SIT) is a software testing method that verifies that all system components are integrated and work together as expected. SIT testing typically takes place after unit testing and before acceptance testing. It can include testing of interfaces, data flow, and business processes. The goal is to ensure that all the individual components of the system have been integrated correctly and that the system functions as a whole as intended.

SIT testing is an essential step in the software testing life cycle because it helps identify and resolve issues before the system is released to end users. It is usually performed by a dedicated testing team with access to the entire system, including all its components and interfaces. The team will create a comprehensive test plan that covers all aspects of the system's functionality. They will use various testing methods, such as manual testing, automated testing, and performance testing.