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(.require
 [library
  [lux (.except)
   [abstract
    [monad (.only do)]
    [\\specification
     ["$[0]" equivalence]]]
   [control
    ["<>" parser]
    ["[0]" try]
    ["[0]" exception]]
   [math
    ["[0]" random (.only Random)]]
   [meta
    ["[0]" location]
    ["[0]" code (.use "[1]#[0]" equivalence)
     ["<[1]>" \\parser]]]
   [test
    ["_" property (.only Test)]]]]
 [\\library
  ["[0]" /]]
 ["$[0]"//
  ["[1][0]" check]
  ["[1]//" ///
   ["[1][0]" code]]])

(def .public random
  (Random /.Definition)
  (all random.and
       (random.alphabetic 5)
       (random.or $//check.random
                  $////code.random)
       random.bit
       ))

(def compiler
  [.#info            [.#target "FAKE"
                      .#version "0.0.0"
                      .#mode {.#Build}
                      .#configuration (list)]
   .#source          [location.dummy 0 ""]
   .#location        location.dummy
   .#current_module  {.#None}
   .#modules         (list)
   .#scopes          (list)
   .#type_context    [.#ex_counter 0
                      .#var_counter 0
                      .#var_bindings (list)]
   .#expected        {.#None}
   .#seed            0
   .#scope_type_vars (list)
   .#extensions      []
   .#eval            (as (-> Type Code (Meta Any)) [])
   .#host            []])

(def .public test
  Test
  (<| (_.covering /._)
      (_.for [/.Definition])
      (all _.and
           (_.for [/.equivalence]
                  ($equivalence.spec /.equivalence ..random))

           (do random.monad
             [expected ..random
              
              type $////code.random
              untyped_value $////code.random]
             (all _.and
                  (_.coverage [/.format /.parser]
                    (when (<code>.result (/.parser compiler)
                                         (list (/.format expected)))
                      {try.#Failure error}
                      false
                      
                      {try.#Success actual}
                      (of /.equivalence = expected actual)))
                  (_.coverage [/.typed]
                    (let [expected (has /.#value {.#Left [type untyped_value]} expected)]
                      (when (<code>.result (/.typed compiler)
                                           (list (/.format expected)))
                        {try.#Failure error}
                        false
                        
                        {try.#Success actual}
                        (of /.equivalence = expected actual))))
                  (_.coverage [/.lacks_type]
                    (let [expected (has /.#value {.#Right untyped_value} expected)]
                      (when (<code>.result (/.typed compiler)
                                           (list (/.format expected)))
                        {try.#Failure error}
                        (exception.match? /.lacks_type error)
                        
                        {try.#Success actual}
                        false)))
                  )))
      ))