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

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

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

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

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

(def: #export 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]
                   ($_ _.and
                       (|> ..random_language
                           (\ ! map (function (_ language)
                                      (/.locale language (#.Some fixed_territory) (#.Some fixed_encoding))))
                           ($hash.spec /.hash))
                       (|> ..random_territory
                           (\ ! map (function (_ territory)
                                      (/.locale fixed_language (#.Some territory) (#.Some fixed_encoding))))
                           ($hash.spec /.hash))
                       (|> ..random_encoding
                           (\ ! map (function (_ encoding)
                                      (/.locale fixed_language (#.Some fixed_territory) (#.Some encoding))))
                           ($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
          )))