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(.module:
  [lux #*
   data/text/format
   ["_" test (#+ Test)]
   ["r" math/random]
   [control
    ["M" monad (#+ Monad do)]
    pipe
    ["p" parser]]
   [data
    ["." error]
    [number
     ["." nat ("#;." decimal)]]
    ["." text ("#;." equivalence)]
    [collection
     ["." list]]]]
  {1
   ["." /]})

(def: #export test
  Test
  (<| (_.context (%name (name-of /.CLI)))
      (do r.monad
        [num-args (|> r.nat (:: @ map (n/% 10)))
         #let [gen-arg (:: @ map nat;encode r.nat)]
         yes gen-arg
         #let [gen-ignore (r.filter (|>> (text;= yes) not)
                                    (r.unicode 5))]
         no gen-ignore
         pre-ignore (r.list 5 gen-ignore)
         post-ignore (r.list 5 gen-ignore)]
        ($_ _.and
            (_.test "Can read any argument."
                    (|> (/.run (list yes) /.any)
                        (case> (#error.Failure _)
                               #0
                               
                               (#error.Success arg)
                               (text;= arg yes))))
            (_.test "Can test tokens."
                    (and (|> (/.run (list yes) (/.this yes))
                             (case> (#error.Failure _)
                                    #0

                                    (#error.Success _)
                                    #1))
                         (|> (/.run (list no) (/.this yes))
                             (case> (#error.Failure _)
                                    #1

                                    (#error.Success _)
                                    #0))))
            (_.test "Can use custom token parsers."
                    (|> (/.run (list yes) (/.parse nat;decode))
                        (case> (#error.Failure _)
                               #0
                               
                               (#error.Success parsed)
                               (text;= (nat;encode parsed)
                                       yes))))
            (_.test "Can query if there are any more inputs."
                    (and (|> (/.run (list) /.end)
                             (case> (#error.Success []) #1 _ #0))
                         (|> (/.run (list yes) (p.not /.end))
                             (case> (#error.Success []) #0 _ #1))))
            (_.test "Can parse CLI input anywhere."
                    (|> (/.run (list.concat (list pre-ignore (list yes) post-ignore))
                               (|> (/.somewhere (/.this yes))
                                   (p.before (p.some /.any))))
                        (case> (#error.Failure _)
                               #0

                               (#error.Success _)
                               #1)))
            ))))