The usage of a graphical user interface (GUI) in software often make up for a greatexperience for the user and is often not an issue, until the only way to run a programis through a GUI. Such a dependency will make development of a project very hardas the only way to perform tests is to execute them manually. This is the case for asimulator that the company Creone uses and it is where we will perform our work.Creone works with smart key management systems and cabinets that allow for a safeand convenient way to store and handle keys. Registered users can open the cabinetswith a pin code that is entered on the dial on the cabinet door. Keys are assigned tousers and what keys that a user can take from a cabinet is seen on the display abovethe dialpad. We are to create a new core implementation that will remove the GUIdependency and allow the simulator to perform automated tests to some extent.