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(.module:
  [library
   [lux "*"
    ["_" test {"+" [Test]}]
    [abstract
     [monad {"+" [do]}]
     [\\specification
      ["$." equivalence]]]
    [control
     ["." maybe]
     ["." try ("#\." functor)]
     [parser
      ["." environment]
      ["<.>" xml]]
     [concurrency
      ["." async]]]
    [data
     ["." text ("#\." equivalence)]
     [collection
      ["." list]]]
    [macro
     ["." code]]
    [math
     ["." random {"+" [Random]} ("#\." monad)]
     [number
      ["n" nat]]]
    ["." time
     ["." date]
     ["." year]
     ["." month]
     ["." instant {"+" [Instant]}]
     ["." duration]]
    [world
     ["." file]
     ["." program]]]]
  ["$." /// "_"
   ["#." artifact
    ["#/." type]
    ["#/." time]
    ["#/." snapshot "_"
     ["#/." version]]]]
  [\\program
   ["." /
    ["/#" //
     ["/#" // "_"
      [artifact
       [versioning {"+" [Versioning]}]
       ["#." snapshot]]
      ["#." repository "_"
       ["#/." local]]]]]])

(def: random_instant
  (Random Instant)
  (do {! random.monad}
    [year (\ ! each (|>> (n.% 9,000) (n.+ 1,000) .int) random.nat)
     month (\ ! each (|>> (n.% 12) (n.+ 1)) random.nat)
     day_of_month (\ ! each (|>> (n.% 28) (n.+ 1)) random.nat)
     hour (\ ! each (n.% 24) random.nat)
     minute (\ ! each (n.% 60) random.nat)
     second (\ ! each (n.% 60) random.nat)]
    (in (try.trusted
         (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])]
           (in (instant.of_date_time date time)))))))

(def: random_versioning
  (Random Versioning)
  ($_ random.and
      (random\in #///snapshot.Local)
      $///artifact/time.random
      (random.list 5 $///artifact/snapshot/version.random)
      ))

(def: .public random
  (Random /.Metadata)
  ($_ random.and
      $///artifact.random
      ..random_versioning
      ))

(def: .public test
  Test
  (<| (_.covering /._)
      (_.for [/.Metadata])
      (do random.monad
        [expected ..random
         .let [artifact (value@ #/.artifact expected)]]
        ($_ _.and
            (_.for [/.equivalence]
                   ($equivalence.spec /.equivalence ..random))
            
            (_.cover [/.format /.parser]
                     (|> expected
                         /.format
                         list
                         (<xml>.result /.parser)
                         (try\each (\ /.equivalence = expected))
                         (try.else false)))
            (_.cover [/.uri]
                     (text\= (//.remote_artifact_uri artifact)
                             (/.uri artifact)))
            (do random.monad
              [home (random.ascii/lower 5)
               working_directory (random.ascii/lower 5)
               .let [program (program.async (program.mock environment.empty home working_directory))
                     fs (file.mock (\ file.default separator))
                     repository (///repository/local.repository program fs)]]
              (in (do async.monad
                    [wrote? (/.write repository artifact expected)
                     actual (/.read repository artifact)]
                    (_.cover' [/.write /.read]
                              (and (case wrote?
                                     (#try.Success _) true
                                     (#try.Failure _) false)
                                   (case actual
                                     (#try.Success actual)
                                     (\ /.equivalence = expected actual)
                                     
                                     (#try.Failure _)
                                     false))))))
            ))))