Main phases in Testing

1. Unit Testing
2. Integration Testing
3. System Testing or Black box testing
4. User Acceptance Testing (UAT)
 

Unit Testing

This testing is done by the developer. The developer tests the module after developing it. Each or single module is tested by the developer and hence called unit testing.

Integration Testing

After unit testing the modules are integrated and the next step is Integration testing.  general the Integration Testing is done by developer but in some companies the Integration testing is performed by testers also. The units are integrated together and tested. The interface between the module is also tested.