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(.using
  [library
   [lux "*"
    ["_" test {"+" Test}]
    [abstract
     [monad {"+" do}]
     [\\specification
      ["$[0]" equivalence]]]
    [control
     ["[0]" try ("[1]#[0]" functor)]
     [parser
      ["<[0]>" text]]]
    [data
     ["[0]" text ("[1]#[0]" equivalence)
      ["%" format {"+" format}]]]
    [math
     ["[0]" random {"+" Random} ("[1]#[0]" monad)]
     [number
      ["n" nat]
      ["i" int]]]
    [time
     ["[0]" instant]]]]
  ["$[0]" /// "_"
   ["[1][0]" stamp]]
  [\\program
   ["[0]" /
    ["//[1]" ///
     ["[1][0]" stamp]
     ["[1][0]" time]]]])

(def: .public random
  (Random /.Value)
  ($_ random.and
      (random.ascii/alpha 5)
      (random.or (random#in [])
                 $///stamp.random)
      ))

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

          (do random.monad
            [sample random
             stamp $///stamp.random]
            (let [version (value@ /.#version sample)

                  local!
                  (text#= version
                          (/.format (with@ /.#snapshot {///.#Local} sample)))

                  remote_format (/.format [/.#version (format version /.snapshot)
                                           /.#snapshot {///.#Remote stamp}])
                  remote!
                  (and (text.starts_with? (format version (///time.format (value@ ///stamp.#time stamp)))
                                          remote_format)
                       (text.ends_with? (%.nat (value@ ///stamp.#build stamp))
                                        remote_format))]
              (_.cover [/.snapshot /.format]
                       (and local!
                            remote!))))
          )))