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... This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
... If a copy of the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.

(.require
 [library
  [lux (.except)
   [abstract
    [monad (.only do)]
    ["[0]" equivalence
     ["[1]T" \\test]]]
   [control
    ["[0]" try]]
   [math
    ["[0]" random (.only Random)]
    [number
     ["n" nat]]]
   [test
    ["_" property (.only Test)]]]]
 [\\library
  ["[0]" / (.only)
   [////
    ["[0]" code
     ["<[1]>" \\parser]]]]])

(def .public random
  (Random /.Declaration)
  (let [word (random.alphabetic 10)]
    (all random.and
         word
         (do [! random.monad]
           [size (of ! each (n.% 10) random.nat)]
           (random.list size word))
         )))

(def .public test
  Test
  (<| (_.covering /._)
      (_.for [/.Declaration
              /.#name /.#arguments])
      (all _.and
           (_.for [/.equivalence]
                  (equivalenceT.spec /.equivalence ..random))

           (do random.monad
             [expected ..random]
             (_.coverage [/.format /.parser]
               (when (<code>.result /.parser
                                    (list (/.format expected)))
                 {try.#Failure _}
                 false
                 
                 {try.#Success actual}
                 (of /.equivalence = expected actual)))))))