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(.using
  [library
   [lux "*"
    ["_" test {"+" Test}]
    [abstract
     [monad {"+" do}]
     [\\specification
      ["$[0]" equivalence]
      ["$[0]" hash]]]
    [math
     ["[0]" random {"+" Random} ("[1]#[0]" monad)]]
    [data
     ["[0]" text ("[1]#[0]" equivalence)
      ["[0]" encoding {"+" Encoding}]]
     [collection
      ["[0]" list]]]]]
  ["[0]" / "_"
   ["[1][0]" language]
   ["[1][0]" territory]]
  [\\library
   ["[0]" /
    ["[0]" language {"+" Language}]
    ["[0]" 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
          )))