What is difference between SITP and UTP in testing?
The Unit Test Plan (UTP) are completed at smallest unit level or stand alone mode. For example you have Customer and invoicing module. So you will do the test on the Customer and Invoice module independently. But later when we want test both customer and invoice in one set we have to integrate them and test it. So that's System Integration Test Plan (SITP).
The UTP can be done using NUNIT. Unit testing is completed normally by developers and System testing is completed normally by testing department in integration mode.