I am writing UI tests and as part of the tests, I will need to send some commands from the test to the app that is being tested. For example, I need to stage some data before I do specific UI actions. What is the best way to do that? I was thinking of using TestServer for that, but could not find enough information in the documentation on how I could use that. The documentation on TestServer does not specify the details, neither could I find any samples for how to use TestServer.