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|
(.module:
[lux #*
["_" test (#+ Test)]
["." io]
[control
pipe
[monad (#+ do Monad)]
{[0 #test]
[/
[".T" functor (#+ Injection Comparison)]
[".T" apply]
[".T" monad]
[".T" equivalence]]}]
[data
text/format
[number
["." nat]]]
[math
["r" random (#+ Random)]]]
{1
["." / (#+ Error)]})
(def: injection
(Injection Error)
(|>> #/.Success))
(def: comparison
(Comparison Error)
(function (_ ==)
(:: (/.equivalence ==) =)))
(def: #export (error element)
(All [a] (-> (Random a) (Random (Error a))))
($_ r.or
(r.ascii 10)
element))
(def: #export test
Test
(<| (_.context (%name (name-of /.Error)))
($_ _.and
(equivalenceT.test (/.equivalence nat.equivalence) (..error r.nat))
(functorT.laws ..injection ..comparison /.functor)
(applyT.laws ..injection ..comparison /.apply)
(monadT.laws ..injection ..comparison /.monad)
(do r.monad
[left r.nat
right r.nat
#let [expected (n/+ left right)
(^open "io@.") io.monad]]
(let []
(_.test "Can add error 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)
_
#0))))))
)))
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