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(.module:
  [library
   [lux #*
    ["_" test (#+ Test)]
    [abstract
     [monad (#+ do)]
     [\\specification
      ["$." equivalence]
      ["$." hash]]]
    [math
     ["." random (#+ Random) ("#\." monad)]]
    [data
     ["." text ("#\." equivalence)
      ["." encoding (#+ Encoding)]]
     [collection
      ["." list]]]]]
  ["." / #_
   ["#." language]
   ["#." territory]]
  [\\library
   ["." /
    ["." language (#+ Language)]
    ["." territory (#+ Territory)]]])

(def: random_language
  (Random Language)
  (random.either (random\in language.afar)
                 (random\in language.zaza)))

(def: random_territory
  (Random Territory)
  (random.either (random\in territory.afghanistan)
                 (random\in territory.zimbabwe)))

(def: random_encoding
  (Random Encoding)
  (random.either (random\in encoding.ascii)
                 (random\in encoding.koi8_u)))

(def: random_locale
  (Random /.Locale)
  (do random.monad
    [language ..random_language
     territory ..random_territory
     encoding ..random_encoding]
    (in (/.locale language (#.Some territory) (#.Some encoding)))))

(def: .public test
  Test
  (<| (_.covering /._)
      (_.for [/.Locale])
      ($_ _.and
          (_.for [/.equivalence]
                 ($equivalence.spec /.equivalence ..random_locale))
          (_.for [/.hash]
                 (do {! random.monad}
                   [fixed_language ..random_language
                    fixed_territory ..random_territory
                    fixed_encoding ..random_encoding]
                   ($_ _.and
                       (|> ..random_language
                           (\ ! each (function (_ language)
                                       (/.locale language (#.Some fixed_territory) (#.Some fixed_encoding))))
                           ($hash.spec /.hash))
                       (|> ..random_territory
                           (\ ! each (function (_ territory)
                                       (/.locale fixed_language (#.Some territory) (#.Some fixed_encoding))))
                           ($hash.spec /.hash))
                       (|> ..random_encoding
                           (\ ! each (function (_ encoding)
                                       (/.locale fixed_language (#.Some fixed_territory) (#.Some encoding))))
                           ($hash.spec /.hash))
                       )))
          
          (do random.monad
            [language ..random_language
             territory ..random_territory
             encoding ..random_encoding
             .let [l_locale (/.locale language #.None #.None)
                   lt_locale (/.locale language (#.Some territory) #.None)
                   le_locale (/.locale language #.None (#.Some encoding))
                   lte_locale (/.locale language (#.Some territory) (#.Some encoding))]
             .let [language_check (and (text\= (language.code language)
                                               (/.code l_locale))
                                       (list.every? (|>> /.code (text.starts_with? (language.code language)))
                                                    (list lt_locale le_locale lte_locale)))
                   territory_check (list.every? (|>> /.code (text.contains? (territory.long_code territory)))
                                                (list lt_locale lte_locale))
                   encoding_check (list.every? (|>> /.code (text.ends_with? (encoding.name encoding)))
                                               (list le_locale lte_locale))]]
            (_.cover [/.locale /.code]
                     (and language_check
                          territory_check
                          encoding_check)))
          
          /language.test
          /territory.test
          )))