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(.module:
[lux #*
["_" test (#+ Test)]
[abstract/monad (#+ do)]
[data
[text
["%" format (#+ format)]]]
[math
["r" random (#+ Random)]]]
{1
["." / (#+ Equivalence)]})
(def: #export (spec (^open "_@.") generator)
(All [a] (-> (Equivalence a) (Random a) Test))
(do r.monad
[left generator
right generator]
(<| (_.context (%.name (name-of /.Equivalence)))
($_ _.and
(_.test "Reflexivity."
(_@= left left))
(_.test "Symmetry."
(if (_@= left right)
(_@= right left)
(not (_@= right left))))))))
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