Systems of argumentation or ’computational dialectic’ are emerging as a powerful means of structuring inter-agent communication in multi-agent systems. Individual systems of computational dialectic have been suggested and implemented to tackle specific problems but no comprehensive assessment has been made of such systems in general. Metrics by which systems of dialectic can be measured and used to provide justification for the widespread adoption of dialectic systems in inter-agent communication are needed. This paper introduces GC0, which is a scenario for dialectic testing, and the Sweetwater framework, a software implementation of GC0 for automated testing of dialectic.