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(.module:
[lux #*
["_" test (#+ Test)]
[abstract
[monad (#+ do)]
{[0 #spec]
[/
["$." equivalence]
["$." functor (#+ Injection)]]}]
[data
["." maybe]
["." bit ("#@." equivalence)]
[number
["n" nat]]]
[math
["." random]]]
{1
["." /]})
(def: (injection value)
(Injection /.Stack)
(/.push value /.empty))
(def: #export test
Test
(<| (_.covering /._)
(_.with-cover [/.Stack])
(do random.monad
[size (:: random.monad map (n.% 100) random.nat)
sample (random.stack size random.nat)
expected-top random.nat]
($_ _.and
(_.with-cover [/.equivalence]
($equivalence.spec (/.equivalence n.equivalence) (random.stack size random.nat)))
(_.with-cover [/.functor]
($functor.spec ..injection /.equivalence /.functor))
(_.cover [/.size]
(n.= size (/.size sample)))
(_.cover [/.empty?]
(bit@= (n.= 0 (/.size sample))
(/.empty? sample)))
(_.cover [/.empty]
(/.empty? /.empty))
(_.cover [/.peek]
(case (/.peek sample)
#.None
(/.empty? sample)
(#.Some _)
(not (/.empty? sample))))
(_.cover [/.pop]
(case (/.pop sample)
#.None
(/.empty? sample)
(#.Some [top remaining])
(:: (/.equivalence n.equivalence) =
sample
(/.push top remaining))))
(_.cover [/.push]
(case (/.pop (/.push expected-top sample))
(#.Some [actual-top actual-sample])
(and (is? expected-top actual-top)
(is? sample actual-sample))
#.None
false))
))))
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