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(.using
 [library
  [lux "*"
   ["_" test {"+" Test}]
   [abstract
    [monad {"+" do}]
    [\\specification
     ["$[0]" equivalence]]]
   [control
    ["[0]" try ("[1]#[0]" functor)]
    ["[0]" exception]
    [parser
     ["<[0]>" text]]]
   [math
    ["[0]" random {"+" Random}]
    [number
     ["n" nat]
     ["i" int]]]
   [time
    ["[0]" date ("[1]#[0]" equivalence)]
    ["[0]" year]]]]
 [\\program
  ["[0]" /]])

(def: .public random
  (Random /.Date)
  (random.one (function (_ raw)
                (try.maybe
                 (do try.monad
                   [year (|> raw date.year year.value i.abs (i.% +9,000) (i.+ +1,000) year.year)
                    raw (date.date year
                                   (date.month raw)
                                   (date.day_of_month raw))]
                   (/.date raw))))
              random.date))

(def: .public test
  Test
  (<| (_.covering /._)
      (_.for [/.Date])
      (do random.monad
        [expected ..random
         candidate random.date]
        (all _.and
             (_.for [/.equivalence]
                    ($equivalence.spec /.equivalence ..random))

             (_.cover [/.format /.parser]
                      (|> expected
                          /.format
                          (<text>.result /.parser)
                          (try#each (# /.equivalence = expected))
                          (try.else false)))
             (_.cover [/.value /.date]
                      (|> expected
                          /.value
                          /.date
                          (try#each (# /.equivalence = expected))
                          (try.else false)))
             (_.cover [/.year_is_out_of_range]
                      (case (/.date candidate)
                        {try.#Success date}
                        (same? candidate (/.value date))
                        
                        {try.#Failure error}
                        (exception.match? /.year_is_out_of_range error)))
             (_.cover [/.epoch]
                      (date#= date.epoch (/.value /.epoch)))
             ))))