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(.using
  [library
   [lux "*"
    ["_" test {"+" Test}]
    [abstract
     [monad {"+" do}]]
    [control
     [pipe {"+" case>}]
     ["[0]" try]
     [parser
      ["[0]" environment]]
     [concurrency
      ["[0]" atom {"+" Atom}]
      ["[0]" async {"+" Async}]]]
    [data
     ["[0]" binary]
     ["[0]" text
      ["%" format {"+" format}]
      [encoding
       ["[0]" utf8]]]
     [collection
      ["[0]" set]]]
    [math
     ["[0]" random]
     [number
      ["n" nat]]]
    [time
     ["[0]" instant]]
    [world
     [console {"+" Console}]
     ["[0]" shell {"+" Exit Shell}]
     ["[0]" program {"+" Program}]
     ["[0]" file
      ["[0]" watch]]]]]
  ["[0]" // "_"
   ["$[0]" version]
   ["$[0]" build]]
  [\\program
   ["[0]" /
    ["//[1]" /// "_"
     [command {"+" Command}]
     ["[1]" profile {"+" Profile}]
     ["[1][0]" action]
     [dependency
      [resolution {"+" Resolution}]]]]])

(def: (command expected_runs end_signal fs dummy_file)
  (-> Nat Text (file.System Async) file.Path
      [(Atom Nat)
       (-> (Console Async) (Program Async) (file.System Async) (Shell Async) Resolution (Command [Exit Any]))])
  (let [@runs (: (Atom Nat)
                 (atom.atom 0))]
    [@runs
     (function (_ console program fs shell resolution profile)
       (do [! async.monad]
         [[_ actual_runs] (async.future (atom.update! ++ @runs))]
         (if (n.= expected_runs actual_runs)
           (in {try.#Failure end_signal})
           (do (try.with !)
             [_ (# fs write (# utf8.codec encoded (%.nat actual_runs)) dummy_file)
              _ (# fs modify
                   (|> actual_runs .int instant.of_millis)
                   dummy_file)]
             (in [shell.normal []])))))]))

(def: .public test
  Test
  (<| (_.covering /._)
      (do [! random.monad]
        [end_signal (random.ascii/alpha 5)
         .let [/ (# file.default separator)
               [fs watcher] (watch.mock /)]
         
         program (random.ascii/alpha 5)
         target (random.ascii/alpha 5)
         source (random.ascii/alpha 5)
         .let [empty_profile (: Profile
                                (# ///.monoid identity))
               with_target (: (-> Profile Profile)
                              (with@ ///.#target target))
               with_program (: (-> Profile Profile)
                               (with@ ///.#program {.#Some program}))
               
               profile (|> empty_profile
                           with_program
                           with_target
                           (with@ ///.#sources (set.of_list text.hash (list source))))]

         home (random.ascii/alpha 5)
         working_directory (random.ascii/alpha 5)
         
         expected_runs (# ! each (|>> (n.% 10) (n.max 2)) random.nat)
         dummy_path (# ! each (|>> (format source /)) (random.ascii/alpha 5))
         [compiler resolution] $build.resolution]
        ($_ _.and
            (_.cover [/.delay]
                     (n.> 0 /.delay))
            (in (do async.monad
                  [verdict (do ///action.monad
                             [_ (# fs make_directory source)
                              _ (# fs write (binary.empty 0) dummy_path)
                              .let [[@runs command] (..command expected_runs end_signal fs dummy_path)]
                              _ (# watcher poll [])]
                             (do [! async.monad]
                               [no_dangling_process! (|> profile
                                                         (with@ ///.#compiler compiler)
                                                         ((/.do! 1 watcher command)
                                                          ($version.echo "")
                                                          (program.async (program.mock environment.empty home working_directory))
                                                          fs
                                                          (shell.async ($build.good_shell []))
                                                          resolution)
                                                         (# ! each (|>> (case> {try.#Failure error}
                                                                               (same? end_signal error)

                                                                               {try.#Success _}
                                                                               false))))
                                correct_number_of_runs! (|> @runs
                                                            atom.read!
                                                            async.future
                                                            (# ! each (n.= expected_runs)))]
                               (in {try.#Success (and correct_number_of_runs!
                                                      no_dangling_process!)})))]
                  (_.cover' [/.do!]
                            (try.else false verdict))))
            ))))