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(.module:
  [library
   [lux "*"
    ["_" test {"+" Test}]
    [abstract
     [monad {"+" do}]
     [\\specification
      ["$[0]" equivalence]]]
    [control
     ["[0]" maybe]
     ["[0]" try ("[1]#[0]" functor)]
     [parser
      ["[0]" environment]
      ["<[0]>" xml]]
     [concurrency
      ["[0]" async]]]
    [data
     ["[0]" text ("[1]#[0]" equivalence)]
     [collection
      ["[0]" list]]]
    [macro
     ["[0]" code]]
    [math
     ["[0]" random {"+" Random} ("[1]#[0]" monad)]
     [number
      ["n" nat]]]
    ["[0]" time
     ["[0]" date]
     ["[0]" year]
     ["[0]" month]
     ["[0]" instant {"+" Instant}]
     ["[0]" duration]]
    [world
     ["[0]" file]
     ["[0]" program]]]]
  ["$[0]" /// "_"
   ["[1][0]" artifact
    ["[1]/[0]" type]
    ["[1]/[0]" time]
    ["[1]/[0]" snapshot "_"
     ["[1]/[0]" version]]]]
  [\\program
   ["[0]" /
    ["/[1]" //
     ["/[1]" // "_"
      [artifact
       [versioning {"+" Versioning}]
       ["[1][0]" snapshot]]
      ["[1][0]" repository "_"
       ["[1]/[0]" 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))))))
            ))))