BDD for financial calculations: Excel vs. Given-When-Then, or both?

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For calculations the key examples are usually given as input-output tables that describe what expected calculation result the system should provide for the different input figures. As for these applications even small mistakes can quickly cause big losses, you better describe them in a way that both the business and the development team can understand them. In our projects most of the stakeholders use and like Excel for describing these and they are masters in doing this. Excel seems to be their DSL, so let's try to use it for generating automated tests!

You can find the slides of Gaspar's talk here

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