Neverfails is a module that involves an ambitious idea: code generation based on specifications. This idea does not depend on a specific platform or programming language. In principle, it could be implemented with any framework. Actually, I have decided to test it using Django as a web framework and Python as the programming language.
Similarly to lettuce, neverfails recognizes the steps using regular expressions and checks whether they pass or fail. If the step fails, neverfails does not raise an AssertionError but runs the code to make the step pass, then runs the step again.