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(.module:
[library
[lux "*"
["_" test {"+" [Test]}]
[abstract
[monad {"+" [do]}]]
[control
["[0]" io]]
[math
["[0]" random]
[number
["n" nat]]]]]
[\\library
["[0]" /]])
(def: .public test
Test
(<| (_.covering /._)
($_ _.and
(do random.monad
[expected random.nat
.let [box (/.atom expected)]]
(_.cover [/.Atom /.atom /.read!]
(io.run!
(do io.monad
[actual (/.read! box)]
(in (same? expected actual))))))
(do random.monad
[target random.nat
unknown (random.only (|>> (same? target) not) random.nat)
expected random.nat
.let [box (/.atom target)]]
(_.cover [/.compare_and_swap!]
(io.run!
(do io.monad
[swapped_unknown? (/.compare_and_swap! unknown expected box)
swapped_target? (/.compare_and_swap! target expected box)
actual (/.read! box)]
(in (and (not swapped_unknown?)
swapped_target?
(same? expected actual)))))))
(do random.monad
[init random.nat
shift random.nat
.let [box (/.atom init)]]
(_.cover [/.update!]
(io.run!
(do io.monad
[[pre post] (/.update! (n.+ shift) box)]
(in (and (same? init pre)
(n.= (n.+ shift init)
post)))))))
(do random.monad
[pre random.nat
post random.nat
.let [box (/.atom pre)]]
(_.cover [/.write!]
(io.run!
(do io.monad
[old (/.write! post box)
new (/.read! box)]
(in (and (same? pre old)
(same? post new)))))))
)))
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