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(.module:
[lux #*
["_" test (#+ Test)]
[control
[monad (#+ do)]
{[0 #test]
[/
[".T" functor (#+ Injection Comparison)]
[".T" apply]
[".T" monad]
[".T" equivalence]]}]
[data
text/format
[number
["." nat]]]
[math
["r" random (#+ Random)]]]
{1
["." / (#+ Lazy)]})
(def: injection
(Injection Lazy)
(|>> /.freeze))
(def: comparison
(Comparison Lazy)
(function (_ ==)
(:: (/.equivalence ==) =)))
(def: #export lazy
(All [a] (-> (Random a) (Random (Lazy a))))
(:: r.functor map (|>> /.freeze)))
(def: #export test
Test
(<| (_.context (%name (name-of /.Lazy)))
(do r.monad
[left r.nat
right r.nat
#let [lazy (/.freeze (n/* left right))
expected (n/* left right)]]
($_ _.and
(_.test "Freezing does not alter the expected value."
(n/= expected
(/.thaw lazy)))
(_.test "Lazy values only evaluate once."
(and (not (is? expected
(/.thaw lazy)))
(is? (/.thaw lazy)
(/.thaw lazy))))
(equivalenceT.test (/.equivalence nat.equivalence) (..lazy r.nat))
(functorT.laws ..injection ..comparison /.functor)
(applyT.laws ..injection ..comparison /.apply)
(monadT.laws ..injection ..comparison /.monad)
))))
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