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(.module:
  [lux #*
   ["_" test (#+ Test)]
   [abstract
    [monad (#+ do)]
    {[0 #spec]
     [/
      ["$." equivalence]]}]
   [control
    ["." try ("#\." functor)]
    [parser
     ["<.>" xml]]]
   [data
    [number
     ["n" nat]]]
   ["." time
    ["." date]
    ["." year]
    ["." month]
    ["." instant (#+ Instant)]
    ["." duration]]
   [math
    ["." random (#+ Random)]]
   [macro
    ["." code]]]
  ["$." /// #_
   [artifact
    ["#." type]]]
  {#program
   ["." /]})

(def: random-instant
  (Random Instant)
  (do {! random.monad}
    [year (\ ! map (|>> (n.% 10,000) .int) random.nat)
     month (\ ! map (n.% 13) random.nat)
     day-of-month (\ ! map (n.% 29) random.nat)
     hour (\ ! map (n.% 24) random.nat)
     minute (\ ! map (n.% 60) random.nat)
     second (\ ! map (n.% 60) random.nat)]
    (wrap (try.assume
           (do try.monad
             [year (year.year year)
              month (month.by-number month)
              date (date.date year month day-of-month)
              time (time.time
                    {#time.hour hour
                     #time.minute minute
                     #time.second second
                     #time.milli-second 0})]
             (wrap (instant.from-date-time date time)))))))

(def: random-versioning
  (Random /.Versioning)
  ($_ random.and
      ..random-instant
      random.nat
      (random.list 5 $///type.random)
      ))

(def: #export random
  (Random /.Metadata)
  ($_ random.and
      (random.ascii/alpha 5)
      (random.ascii/alpha 5)
      (random.ascii/alpha 5)
      ..random-versioning))

(def: #export test
  Test
  (<| (_.covering /._)
      (_.for [/.Metadata])
      ($_ _.and
          (_.for [/.equivalence]
                 ($equivalence.spec /.equivalence ..random))
          (do random.monad
            [expected ..random]
            (_.cover [/.write /.parser]
                     (|> expected
                         /.write
                         (<xml>.run /.parser)
                         (try\map (\ /.equivalence = expected))
                         (try.default false))))
          )))