A development system comprises a user interface component and a customization component configured to receive developer customization inputs and to customize a portion of a computing system based on the developer customization inputs. The portion comprises types modeled in the computing system. The development system also comprises a test generation component configured to identify a test value by accessing a test knowledge set based on the types, control the user interface component to generate a user interface display that displays an indication of the test value, and generate a test for the portion of the computing system.
