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