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(.module:
[library
[lux "*"
["_" test {"+" [Test]}]
[abstract
[equivalence {"+" [Equivalence]}]
[monad {"+" [do]}]]
[control
["[0]" function]]
[math
["[0]" random]
[number
["n" nat]]]]]
[\\library
["[0]" / {"+" [Functor]}]])
(def: (identity equivalence value (^open "@//[0]"))
(All (_ f a) (-> (Equivalence (f a)) (f a) (Functor f) Test))
(_.test "Law of identity."
(equivalence
(@//each function.identity value)
value)))
(def: .public (spec equivalence value functor)
(All (_ f a) (-> (Equivalence (f a)) (f a) (Functor f) Test))
(do random.monad
[sample random.nat]
(<| (_.for [/.Functor])
($_ _.and
(..identity equivalence value functor)
))))
|
