> it occurred to me that it would actually be kind of great to write tests where the entire implementation including the language itself could be swapped out wi

> it occurred to me that it would actually be kind of great to write tests where the entire implementation including the language itself could be swapped out without really changing the tests. I think this basically already exists with "Cucumber" and behavior-driven development. The test definition is specified in a natural-language-looking DSL which supports a number of underlying languages. When you swapped out the system you would have to implement the step definitions in the new language, but the tests would remain valid.