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(.module:
[lux #*
["_" test (#+ Test)]
[abstract/monad (#+ do)]
[data
[text
["%" format (#+ format)]]
[number
["n" nat]]]
[math
["r" random (#+ Random)]]]
{1
["." / (#+ Order)]})
(def: #export test
Test
(<| (_.context (%.name (name-of /.Codec)))
(do r.monad
[left r.nat
right (|> r.nat (r.filter (|>> (n.= left) not)))])
($_ _.and
(_.test (format (%.name (name-of /.min)) " &&& " (%.name (name-of /.max)))
(n.< (/.max n.order left right)
(/.min n.order left right)))
)))
(def: #export (spec (^open ",@.") generator)
(All [a] (-> (Order a) (Random a) Test))
(<| (_.context (%.name (name-of /.Order)))
(do r.monad
[parameter generator
subject generator])
($_ _.and
(_.test "Values are either ordered, or they are equal. All options are mutually exclusive."
(cond (,@< parameter subject)
(not (or (,@< subject parameter)
(,@= parameter subject)))
(,@< subject parameter)
(not (,@= parameter subject))
## else
(,@= parameter subject))))))
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