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|
(.module:
[lux #*
data/text/format
[control/monad (#+ do)]
["r" math/random (#+ Random)]
["_" test (#+ Test)]
[control
[equivalence (#+ Equivalence)]]
[data
["." bit]
["." maybe]
[number
["." int ("#@." number)]]
["." text]
[collection
["." list]]]
["." macro
[poly (#+ derived:)]]]
{1
["." /]})
(type: Variant
(#Case0 Bit)
(#Case1 Int)
(#Case2 Frac))
(type: #rec Recursive
(#Number Frac)
(#Addition Frac Recursive))
(type: Record
{#bit Bit
#int Int
#frac Frac
#text Text
#maybe (Maybe Int)
#list (List Int)
#variant Variant
#tuple [Int Frac Text]
#recursive Recursive})
(def: gen-recursive
(r.Random Recursive)
(r.rec (function (_ gen-recursive)
(r.or r.frac
(r.and r.frac gen-recursive)))))
(def: gen-record
(r.Random Record)
(do r.monad
[size (:: @ map (n/% 2) r.nat)
#let [gen-int (|> r.int (:: @ map (|>> int@abs (i/% +1,000,000))))]]
($_ r.and
r.bit
gen-int
r.frac
(r.unicode size)
(r.maybe gen-int)
(r.list size gen-int)
($_ r.or r.bit gen-int r.frac)
($_ r.and gen-int r.frac (r.unicode size))
gen-recursive)))
(derived: equivalence (/.equivalence Record))
(def: #export test
Test
(<| (_.context (%name (name-of /._)))
(do r.monad
[sample gen-record
#let [(^open "/@.") ..equivalence]]
(_.test "Every instance equals itself."
(/@= sample sample)))))
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