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(.module:
[lux #*
["." io (#+ IO)]
["_" test (#+ Test)]
[control
[monad (#+ do)]
{[0 #test]
[/
["$." functor (#+ Injection Comparison)]
["$." apply]
["$." monad]]}]
[data
[text
format]]
[math
["r" random]]]
{1
["." / (#+ Reader)]})
(def: (injection value)
(Injection (All [a r] (Reader r a)))
(function (_ env)
value))
(def: comparison
(Comparison (All [a r] (Reader r a)))
(function (_ == left right)
(== (/.run [] left) (/.run [] right))))
(def: #export test
Test
(<| (_.context (%name (name-of /.Reader)))
(do r.monad
[sample r.nat
factor r.nat]
($_ _.and
($functor.spec ..injection ..comparison /.functor)
($apply.spec ..injection ..comparison /.apply)
($monad.spec ..injection ..comparison /.monad)
(_.test "Can query the environment."
(n/= sample
(/.run sample /.ask)))
(_.test "Can modify an environment locally."
(n/= (n/* factor sample)
(/.run sample (/.local (n/* factor) /.ask))))
(let [(^open "io@.") io.monad]
(_.test "Can add reader functionality to any monad."
(|> (: (/.Reader Any (IO Nat))
(do (/.with io.monad)
[a (/.lift (io@wrap sample))
b (wrap factor)]
(wrap (n/* b a))))
(/.run [])
io.run
(n/= (n/* factor sample)))))))))
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