In real life writing tests can be hard and making mistakes is easy, when the business rules are not clear enough.
In a short workshop, we can try a technique closing the gap between a loose specification and the acceptance tests. It is called Example Mapping. This technique was proposed by Matt Wynne from the Behavior Driven Development community. Example mapping helps in understanding the business domain before writing test and code. It allows seeing the unknowns earlier, communicating with business people in the language they understand, prototyping without coding and to save time and efforts by failing and learning fast.
Let us analyze existing business rules and transform them into examples, assumptions, and questions. Later we use our examples to test drive the development. And we get time to share our learnings