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(.module:
  [library
   [lux #*
    ["_" test (#+ Test)]
    [abstract
     [monad (#+ do)]
     [\\spec
      ["$." equivalence]]]
    [control
     ["." try]
     [parser
      ["<.>" code]]]
    [data
     [collection
      ["." list]]]
    [math
     ["." random (#+ Random)]
     [number
      ["n" nat]]]]]
  [\\library
   ["." /]]
  ["$." /// #_
   ["#." code]])

(def: #export random
  (Random /.Annotations)
  (let [word (random.ascii/alpha 10)
        tag (random.and word word)]
    (do {! random.monad}
      [size (\ ! map (n.% 10) random.nat)]
      (random.list size (random.and tag $///code.random)))))

(def: #export test
  Test
  (<| (_.covering /._)
      (_.for [/.Annotations])
      ($_ _.and
          (_.for [/.equivalence]
                 ($equivalence.spec /.equivalence ..random))

          (_.cover [/.empty]
                   (list.empty? /.empty))
          (do random.monad
            [expected ..random]
            (_.cover [/.format /.parser]
                     (case (<code>.run /.parser
                                       (list (/.format expected)))
                       (#try.Failure _)
                       false
                       
                       (#try.Success actual)
                       (\ /.equivalence = expected actual))))
          )))