Well Ruby has RSpec:

http://en.wikipedia.org/wiki/RSpec
http://en.wikipedia.org/wiki/Behavior_driven_development
http://rspec.info/

It's not part of the Ruby language but it does have its own domain specific
language, something Ruby excels at.
Is this what you mean?

Regards,
    Anthony

(de-lurking)

On Sun, Oct 10, 2010 at 8:21 PM, Julian Leviston <[email protected]>wrote:

> Does anyone know about a language (possibly something in smalltalk) that
> involves spec-driven development?
>
> A language that stipulates a spec (in code - ie a test) must be written
> before any code can be written, and that can also do self-checks (sort of
> like a checksum) before the code is executed?
>
> Julian.
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>
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