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... This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
... If a copy of the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
(.require
[library
[lux (.except)
[abstract
[equivalence (.only Equivalence)]
[monoid (.only Monoid)]
["[0]" monad (.only do)
["[1]T" \\test]]
["[0]" functor
["[1]T" \\test (.only Injection Comparison)]]
["[0]" apply
["[1]T" \\test]]]
[control
["[0]" io]]
[data
["[0]" text (.use "[1]#[0]" equivalence)]]
[math
["[0]" random]
[number
["n" nat]]]
[test
["_" property (.only Test)]]]]
[\\library
["[0]" / (.only Writer)]])
(def (injection monoid value)
(All (_ w) (-> (Monoid w) (Injection (Writer w))))
[(of monoid identity) value])
(def comparison
(All (_ w) (Comparison (Writer w)))
(function (_ == [_ left] [_ right])
(== left right)))
(def .public test
Test
(do random.monad
[log (random.ascii 1)
left random.nat
right random.nat]
(<| (_.covering /._)
(_.for [/.Writer
/.#log /.#value])
(all _.and
(_.for [/.functor]
(functorT.spec (..injection text.monoid) ..comparison /.functor))
(_.for [/.apply]
(applyT.spec (..injection text.monoid) ..comparison (/.apply text.monoid)))
(_.for [/.monad]
(monadT.spec (..injection text.monoid) ..comparison (/.monad text.monoid)))
(_.coverage [/.write]
(text#= log
(the /.#log (/.write log))))
(_.coverage [/.with /.lifted]
(let [lifted (/.lifted text.monoid io.monad)
(open "io#[0]") io.monad]
(|> (do (/.with text.monoid io.monad)
[a (lifted (io#in left))
b (in right)]
(in (n.+ a b)))
io.run!
(the /.#value)
(n.= (n.+ left right)))))
))))
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