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#clojure-spec
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2018-05-04
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jstew00:05:19

What do I use if I just want to ensure that a fn returns a string or something?

(s/fdef ::string-fn
        :args (s/cat)
        :ret string?)
(s/explain ::string-fn #(identity "string"))

jstew00:05:36

It wants me to add test.check as a dependency

alexmiller01:05:18

I think you’re mixing syntax here and that’s leading you down a path trying to gen anonymous functions with check

alexmiller01:05:49

(s/def ::string-fn (s/fspec :args (s/cat) ret string?)) would be better for this

alexmiller01:05:52

When function specs are validated they use the generator for the anonymous function to invoke the function being validated and verify the outputs. Using that generator requires test.check

jstew10:05:00

Ah hah. That makes sense. Thank you, Alex.