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(.using
 [library
  [lux (.except)
   ["_" test (.only Test)]
   [abstract
    [monad (.only do)]]
   [control
    ["[0]" maybe]
    ["[0]" try (.open: "[1]#[0]" functor)]
    [parser
     ["<[0]>" code]]]
   [macro
    ["[0]" code (.open: "[1]#[0]" equivalence)]]
   [math
    ["[0]" random (.only Random)]
    [number
     ["n" nat]]]]]
 [\\library
  ["[0]" /]])

(def export
  (Random [(Maybe Code) Nat])
  (all random.and
       (|> random.bit
           (at random.monad each code.bit)
           random.maybe)
       random.nat))

(def .public test
  Test
  (<| (_.covering /._)
      (do random.monad
        [[expected_export_policy expected_un_exported] ..export]
        (_.coverage [/.parser /.default_policy]
          (|> (case expected_export_policy
                {.#Some expected_export_policy}
                (list expected_export_policy (code.nat expected_un_exported))

                {.#None}
                (list (code.nat expected_un_exported)))
              (<code>.result (/.parser <code>.nat))
              (try#each (function (_ [actual_export_policy actual_un_exported])
                          (|> expected_export_policy
                              (maybe.else /.default_policy)
                              (code#= actual_export_policy)
                              (and (n.= expected_un_exported actual_un_exported)))))
              (try.else false))))))