blob: 198d3da5056da700d3d9eebde359276b03296914 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
|
(.module:
[lux #*
["_" test (#+ Test)]
[abstract
[monad (#+ do)]]
[math
["." random (#+ Random)]]]
{1
["." /]})
(def: #export (spec (^open "/@.") gen-sample)
(All [a] (-> (/.Enum a) (Random a) Test))
(do random.monad
[sample gen-sample]
(<| (_.with-cover [/.Enum])
($_ _.and
(_.test "Successor and predecessor are inverse functions."
(and (/@= (|> sample /@succ /@pred)
sample)
(/@= (|> sample /@pred /@succ)
sample)
(not (/@= (/@succ sample)
sample))
(not (/@= (/@pred sample)
sample))))
))))
|
