Unit Testing :  Developers are responsible for most of the Unit Testing activities. In this level of testing Developers will test their individual programs to check for code readiness . After successful completion of Unit Testing code will be moved to Integration Environment.

 

Integration Testing : Integration is a level which will contain group of executable programs from all developers and Dev Team is responsible for 'white box' testing activities.

 

System Testing :  After successful completion of Integration code will be deployed in SIT environment . SIT environment for QA to test their Functional and Non-Functional requirements.

User Acceptance Testing: After sucessful completion of SIT code will deploy in UAT environment . During UAT BA team will perform testing to test (Business Requirements) with production like data