(.module:
  [library
   [lux "*"
    ["_" test {"+" [Test]}]
    [abstract
     [monad {"+" [do]}]
     [\\specification
      ["$." equivalence]]]
    [data
     ["." binary "_"
      ["#T" \\test]]]
    [math
     ["." random {"+" [Random]} ("#\." monad)]]]]
  ["$." /// "_"
   ["#." hash]]
  [\\program
   ["." /
    ["//#" /// "_"
     ["#." hash]]]])

(def: .public random
  (Random /.Status)
  ($_ random.or
      (random\in [])
      (random.or ($///hash.random ///hash.sha-1)
                 ($///hash.random ///hash.md5))
      (random.and ($///hash.random ///hash.sha-1)
                  ($///hash.random ///hash.md5))
      ))

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

                 (do random.monad
                   [payload (binaryT.random 1)]
                   (_.cover [/.verified]
                            (case (/.verified payload)
                              (#/.Verified sha1 md5)
                              true

                              _
                              false)))
                 ))))