System tests run as a step within the Continuous Delivery pipeline. They connect against a running application on a test environment, invoke business use cases, and verify the overall outcome.
System test cases usually don't impact the application's life cycle. The application is deployed upfront as part of the CD pipeline. If required, the system tests control the state and behavior of external mocks and contents of databases.
Generally speaking, it makes sense to develop system tests as separate build projects without any code dependency to the project. Since system tests access the application from the outside there should be no implications on how the system is being used. System tests are developed against the ...