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<https://stackoverflow.com/questions/46592767/how-do-i-make-custom-clojure-spec-generator#>
I'm trying to spec the following data structure called Connection:
{:id "some string" :channel "instance of org.httpkit.server.AsyncChannel" }
Here is my spec:
(defn make-channel []
(proxy [AsyncChannel] [nil nil]
(toString [] "mock AsyncChannel")))
(defn channel-gen
[]
(->> (s/gen (s/int-in 0 1))
(gen/fmap (fn [_] (make-channel)))))
(s/def ::channel (s/spec (::channel-type)
:gen channel-gen))
(s/def ::id string?)
(s/def ::connection (s/keys :req-un [::channel ::id]))
(s/fdef make-connection
:args ::channel
:ret ::connection)
I'm getting the following error and I have no clue what is wrong here:
clojure.lang.ExceptionInfo: Unable to construct gen at: [] for:
gameserve.ws$make_connection@788ffa19
clojure.lang.Compiler$CompilerException: clojure.lang.ExceptionInfo: Unable to
construct gen at: [] for: gameserve.ws$make_connection@788ffa19
#:clojure.spec.alpha{:path [], :form #object[gameserve.ws$make_connection
0x788ffa19 "gameserve.ws$make_connection@788ffa19"], :failure :no-gen}
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