Demonstrating runtime assertion checking using Snap!

This paper details the design of an extension to the visual programming language Snap! that aims to implement program verification using runtime assertion checking. In order to design this, we have looked at other program verification tools and how Snap! works. Three designs for implementing the verification in the user interface have been suggested, and a prototype has been made that uses one of the design options. This prototype contains preconditions, postconditions, assertions and a few extra Boolean logic blocks. It has also been tested if the verification techniques do work as expected.