I built this documentation/testing framework to do just that: https://hitchdev.com/hitchstory

I realized one day that the specs, tests and how-to markdown documentation I wrote all used the same examples.

From that I derived the idea to create a "spec" DSL that could both be run as a test and generate markdown (with screenshots, etc.) to make nice high level how-tos.

Cucumber has the same sort of idea but the DSL really isn't suitable.