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(.module:
[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]
($_ _.and
(_.for [/.equivalence]
($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)))
))))
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