#Model Based Testing

Model-Based Testing for Dungeons & Dragons

This article demonstrates a formal modeling approach to D&D combat mechanics using state machines and formal specification languages, revealing that complex rule interactions (counterspells, reactions, interrupts) create combinatorial complexity that far exceeds single-entity logic. For IT organizations, this case study illustrates how seemingly simple business domains mask hidden complexity in state management, requiring rigorous formal verification before building dependent systems to prevent downstream failures. The approach—tackling the hardest interactions first and using tagged union types for state recovery—offers a reusable pattern for enterprises managing complex, nested workflows with multiple interdependent actors and rollback requirements.