System testing

This level of test is where you validate the entire integrated system to ensure it complies with the specified user requirements. This test is usually performed immediately after the integration test and is carried out by dedicated testers or quality assurance analysts.

The whole software system suite is tested from the user's perspective to identify hidden issues or bugs and usability problems. A rigorous testing of the implemented system is done with the real inputs that the system is meant to process and output is validated against the expected data.