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(.using
  [library
   [lux "*"
    ["_" test {"+" Test}]
    [abstract
     [monad {"+" do}]]
    [control
     ["[0]" maybe]
     ["[0]" try]
     ["[0]" exception {"+" exception:}]
     [concurrency
      ["[0]" async {"+" Async}]]]
    [data
     ["[0]" text ("[1]#[0]" equivalence)
      ["%" format {"+" format}]]]
    [math
     ["[0]" random]]
    [tool
     [compiler
      ["[0]" version]
      ["[0]" language "_"
       ["[1]/[0]" lux "_"
        ["[1]" version]]]]]
    [world
     ["[0]" console {"+" Console Mock}]]]]
  [///
   ["@[0]" profile]]
  [\\program
   ["[0]" /]])

(exception: .public console_is_closed!)

(implementation: mock
  (Mock [Bit Text])

  (def: (on_read [open? state])
    (if open?
      (try.of_maybe
       (do maybe.monad
         [head (text.char 0 state)
          [_ tail] (text.split_at 1 state)]
         (in [[open? tail] head])))
      (exception.except ..console_is_closed! [])))
  (def: (on_read_line [open? state])
    (if open?
      (try.of_maybe
       (do maybe.monad
         [[output state] (text.split_by text.new_line state)]
         (in [[open? state] output])))
      (exception.except ..console_is_closed! [])))
  (def: (on_write input [open? state])
    (if open?
      {try.#Success [open? (format state input)]}
      (exception.except ..console_is_closed! [])))
  (def: (on_close [open? buffer])
    (if open?
      {try.#Success [false buffer]}
      (exception.except ..console_is_closed! []))))

(def: .public echo
  (-> Text (Console Async))
  (|>> [true]
       (console.mock ..mock)
       console.async))

(def: .public test
  Test
  (<| (_.covering /._)
      (do random.monad
        [profile @profile.random]
        (in (do async.monad
              [.let [console (..echo "")]
               verdict (do (try.with async.monad)
                         [_ (/.do! console profile)
                          logging (# console read_line [])]
                         (in (text#= (version.format language/lux.version)
                                     logging)))]
              (_.cover' [/.do!]
                        (try.else false verdict)))))))