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(.module:
[lux #*
["_" test (#+ Test)]
[abstract
[monad (#+ do Monad)]
{[0 #spec]
[/
["$." functor (#+ Injection Comparison)]
["$." apply]
["$." monad]
["$." equivalence]]}]
[control
pipe
["." io]]
[data
["." text ("#@." equivalence)]
[number
["n" nat]]]
[math
["." 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))))
($_ random.or
(random.unicode 1)
element))
(def: #export test
Test
(<| (_.covering /._)
(_.with-cover [/.Try])
(do random.monad
[expected random.nat
alternative (|> random.nat (random.filter (|>> (n.= expected) not)))
error (random.unicode 1)
#let [(^open "io@.") io.monad]])
($_ _.and
(_.with-cover [/.equivalence]
($equivalence.spec (/.equivalence n.equivalence) (..try random.nat)))
(_.with-cover [/.functor]
($functor.spec ..injection ..comparison /.functor))
(_.with-cover [/.apply]
($apply.spec ..injection ..comparison /.apply))
(_.with-cover [/.monad]
($monad.spec ..injection ..comparison /.monad))
(_.cover [/.succeed]
(case (/.succeed expected)
(#/.Success actual)
(n.= expected actual)
_
false))
(_.cover [/.fail]
(case (/.fail error)
(#/.Failure message)
(text@= error message)
_
false))
(_.cover [/.assume]
(n.= expected
(/.assume (/.succeed expected))))
(_.cover [/.from-maybe]
(case [(/.from-maybe (#.Some expected))
(/.from-maybe #.None)]
[(#/.Success actual) (#/.Failure _)]
(n.= expected actual)
_
false))
(_.cover [/.to-maybe]
(case [(/.to-maybe (/.succeed expected))
(/.to-maybe (/.fail error))]
[(#.Some actual) #.None]
(n.= expected actual)
_
false))
(_.cover [/.default]
(and (n.= expected
(/.default alternative (/.succeed expected)))
(n.= alternative
(/.default alternative (: (Try Nat)
(/.fail error))))))
(_.cover [/.with /.lift]
(let [lift (/.lift io.monad)]
(|> (do (/.with io.monad)
[a (lift (io@wrap expected))
b (wrap alternative)]
(wrap (n.+ a b)))
io.run
(case> (#/.Success result)
(n.= (n.+ expected alternative)
result)
_
false))))
)))
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