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