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(.module:
[lux #*
["_" test (#+ Test)]
[abstract
[monad (#+ do Monad)]
{[0 #test]
[/
["$." functor (#+ Injection Comparison)]
["$." apply]
["$." monad]
["$." equivalence]]}]
[control
pipe
["." io]]
[data
["%" text/format (#+ format)]
[number
["n" nat]]]
[math
["r" random (#+ Random)]]]
{1
["." / (#+ Try)]})
(def: injection
(Injection Try)
(|>> #/.Success))
(def: comparison
(Comparison Try)
(function (_ ==)
(:: (/.equivalence ==) =)))
(def: #export (try element)
(All [a] (-> (Random a) (Random (Try a))))
($_ r.or
(r.unicode 1)
element))
(def: #export test
Test
(<| (_.context (%.name (name-of /._)))
($_ _.and
($equivalence.spec (/.equivalence n.equivalence) (..try r.nat))
($functor.spec ..injection ..comparison /.functor)
($apply.spec ..injection ..comparison /.apply)
($monad.spec ..injection ..comparison /.monad)
(do r.monad
[left r.nat
right r.nat
#let [expected (n.+ left right)
(^open "io@.") io.monad]]
(_.test "Can add try functionality to any monad."
(let [lift (/.lift io.monad)]
(|> (do (/.with io.monad)
[a (lift (io@wrap left))
b (wrap right)]
(wrap (n.+ a b)))
io.run
(case> (#/.Success actual)
(n.= expected actual)
_
false)))))
)))
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