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(.module:
  [library
   [lux #*
    ["_" test (#+ Test)]
    [abstract
     [monad (#+ do)]]
    [control
     ["." io]]
    [time
     ["." instant (#+ Instant)]
     ["." duration]]
    [math
     ["." random]
     [number
      ["n" nat]
      ["i" int]]]]]
  [\\library
   ["." /
    [//
     ["." atom (#+ Atom)]
     ["." promise]]]])

(def: #export test
  Test
  (<| (_.covering /._)
      (do {! random.monad}
        [dummy random.nat
         expected random.nat
         delay (\ ! map (|>> (n.% 5) (n.+ 5))
                  random.nat)]
        ($_ _.and
            (_.cover [/.parallelism]
                     (n.> 0 /.parallelism))
            (wrap (do promise.monad
                    [reference_time (promise.future instant.now)
                     #let [box (atom.atom [reference_time dummy])]
                     _ (promise.future
                        (/.schedule delay (do io.monad
                                            [execution_time instant.now]
                                            (atom.write [execution_time expected] box))))
                     _ (promise.wait (n.* 2 delay))
                     [execution_time actual] (promise.future (atom.read box))]
                    (_.cover' [/.schedule]
                              (let [expected_delay!
                                    (i.>= (.int delay)
                                          (duration.to_millis (instant.span reference_time execution_time)))

                                    correct_value!
                                    (n.= expected actual)]
                                (and expected_delay!
                                     correct_value!)))))
            ))))