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Yup, specs can be used at runtime as well. Very helpful to validate data, or perhaps a set of business rules. Insures the spec you use to test is the same logic you use at runtime.

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>specs can be used at runtime as well.

What do you mean "as well"? I thought it was only a runtime check at all.

i think they're talking about production run time versus development runtime. think of it as turning asserts off on production builds. but spec can conform data and explain the reason for non-conformance so some might leave some spec in production for logging, messages, etc.

^^ this, using spec at run time in your actual application logic

One of the stated goals of spec is generative testing. While technically runtime, it's is not runtime from the user's point of view.

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