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(.module:
[library
[lux #*
["_" test (#+ Test)]
[abstract
[monad (#+ do)]]
[math
["." random (#+ Random)]]]]
[\\library
["." /]])
(def: .public (spec (^open "\.") gen_sample)
(All (_ a) (-> (/.Enum a) (Random a) Test))
(do random.monad
[sample gen_sample]
(<| (_.for [/.Enum])
($_ _.and
(_.test "Successor and predecessor are inverse functions."
(and (\= (|> sample \succ \pred)
sample)
(\= (|> sample \pred \succ)
sample)
(not (\= (\succ sample)
sample))
(not (\= (\pred sample)
sample))))
))))
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