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(.module:
[library
[lux #*
["_" test (#+ Test)]
[abstract
[monad (#+ do)]
[\\specification
["$." equivalence]]]
[control
["." maybe ("#\." monad)]]
[data
["." bit ("#\." equivalence)]
["." text]
[collection
["." set]
["." list]]]
[math
["." random (#+ Random)]
[number
["n" nat]]]]]
[\\library
["." /]])
(def: .public (random size gen_key gen_value)
(All [v]
(-> Nat (Random Text) (Random v) (Random (/.PList v))))
(do random.monad
[keys (random.set text.hash size gen_key)
values (random.list size gen_value)]
(in (list.zipped/2 (set.list keys) values))))
(def: .public test
Test
(<| (_.covering /._)
(_.for [/.PList])
(do {! random.monad}
[.let [gen_key (random.ascii/alpha 10)]
size (\ ! each (n.% 100) random.nat)
sample (..random size gen_key random.nat)
.let [keys (|> sample /.keys (set.of_list text.hash))]
extra_key (random.only (|>> (set.member? keys) not)
gen_key)
extra_value random.nat
shift random.nat]
($_ _.and
(_.for [/.equivalence]
($equivalence.spec (/.equivalence n.equivalence)
(..random size gen_key random.nat)))
(_.cover [/.size]
(n.= size (/.size sample)))
(_.cover [/.empty?]
(bit\= (n.= 0 (/.size sample))
(/.empty? sample)))
(_.cover [/.empty]
(/.empty? /.empty))
(_.cover [/.keys /.values]
(\ (/.equivalence n.equivalence) =
sample
(list.zipped/2 (/.keys sample)
(/.values sample))))
(_.cover [/.contains?]
(and (list.every? (function (_ key)
(/.contains? key sample))
(/.keys sample))
(not (/.contains? extra_key sample))))
(_.cover [/.has]
(let [sample+ (/.has extra_key extra_value sample)]
(and (not (/.contains? extra_key sample))
(/.contains? extra_key sample+)
(n.= (++ (/.size sample))
(/.size sample+)))))
(_.cover [/.value]
(|> sample
(/.has extra_key extra_value)
(/.value extra_key)
(maybe\each (n.= extra_value))
(maybe.else false)))
(_.cover [/.revised]
(|> sample
(/.has extra_key extra_value)
(/.revised extra_key (n.+ shift))
(/.value extra_key)
(maybe\each (n.= (n.+ shift extra_value)))
(maybe.else false)))
(_.cover [/.lacks]
(|> sample
(/.has extra_key extra_value)
(/.lacks extra_key)
(\ (/.equivalence n.equivalence) = sample)))
))))
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