Introduction
SIT is part of the software testing life cycle for collaborative projects. Usually, a round of SIT precedes the user acceptance test (UAT) round. And software providers usually run a pre-SIT round before consumers run their SIT test cases.
For example, if integrator (company) is providing an enhancement to customer's existing solution, then they integrate the new application layer and the new database layer with existing customer's application and existing database layers. After the integration completes, users use the new part (extended part) of the integrated application to update data. Along they use old part (pre-existing part) of the integrated application. A process should exist to exchange data imports and exports between the two data layers. This data exchange process should keep both systems up-to-date. Purpose of the system integration testing is to make sure whether these systems are successfully integrated and been up-to-date by exchanging data with each other.
There may be more parties in the integration, for example the customer (consumer) can have their own customers; there may be also multiple providers.
Read more about this topic: System Integration Testing
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