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(.module: {#.doc "Tools for unit & property-based/generative testing."}
[lux #*
[macro (#+ with-gensyms)
["s" syntax (#+ syntax: Syntax)]
[code]]
[control
[monad (#+ do Monad)]
["p" parser]]
[concurrency [promise (#+ Promise)]]
[data
[product]
[maybe]
["e" error]
["." text
format]
[collection [list ("list/" Monad<List> Fold<List>)]]]
[io (#+ IO io)]
[time
[instant]
[duration]]
["r" math/random]])
## [Types]
(type: #export Counters [Nat Nat])
(type: #export Seed
{#.doc "The seed value used for random testing (if that feature is used)."}
(I64 Any))
(type: #export Test
(r.Random (Promise [Counters Text])))
(def: pcg-32-magic-inc Nat +12345)
## [Values]
(def: success Counters [+1 +0])
(def: failure Counters [+0 +1])
(def: start Counters [+0 +0])
(def: (add-counters [s f] [ts tf])
(-> Counters Counters Counters)
[(n/+ s ts) (n/+ f tf)])
(def: #export (fail message)
(All [a] (-> Text Test))
(|> [failure (format " [Error] " message)]
(:: promise.Monad<Promise> wrap)
(:: r.Monad<Random> wrap)))
(def: #export (assert message condition)
{#.doc "Check that a condition is true, and fail with the given message otherwise."}
(-> Text Bool (Promise [Counters Text]))
(<| (:: promise.Monad<Promise> wrap)
(if condition
[success (format "[Success] " message)]
[failure (format " [Error] " message)])))
(def: #export (test message condition)
{#.doc "Check that a condition is true, and fail with the given message otherwise."}
(-> Text Bool Test)
(:: r.Monad<Random> wrap (assert message condition)))
(def: (run' tests)
(-> (List [Text (IO Test) Text]) (Promise Counters))
(do promise.Monad<Promise>
[test-runs (|> tests
(list/map (: (-> [Text (IO Test) Text] (Promise Counters))
(function (_ [module test description])
(do @
[#let [pre (io.run instant.now)]
[counters documentation] (|> (io.run test)
(r.run (r.pcg-32 [pcg-32-magic-inc
(instant.to-millis pre)]))
product.right)
#let [post (io.run instant.now)
_ (log! (format "@ " module " "
"(" (%duration (instant.span pre post)) ")"
"\n"
description "\n"
"\n" documentation "\n"))]]
(wrap counters)))))
(monad.seq @))]
(wrap (list/fold add-counters start test-runs))))
(def: failed?
(-> Counters Bool)
(|>> product.right (n/> +0)))
(def: #export (seed value test)
(-> Seed Test Test)
(function (_ prng)
(let [[_ result] (r.run (r.pcg-32 [pcg-32-magic-inc value])
test)]
[prng result])))
(def: (times-failure seed documentation)
(-> (I64 Any) Text Text)
(format "Failed with this seed: " (%n (.nat seed)) "\n"
documentation))
(def: #export (times amount test)
(-> Nat Test Test)
(cond (n/= +0 amount)
(fail "Cannot try a test 0 times.")
(n/= +1 amount)
test
## else
(do r.Monad<Random>
[seed r.i64]
(function (_ prng)
(let [[prng' instance] (r.run (r.pcg-32 [pcg-32-magic-inc seed]) test)]
[prng' (do promise.Monad<Promise>
[[counters documentation] instance]
(if (failed? counters)
(wrap [counters (times-failure seed documentation)])
(product.right (r.run prng' (times (dec amount) test)))))])))))
## [Syntax]
(syntax: #export (context: description test)
{#.doc (doc "Macro for definint tests."
(context: "Simple macros and constructs"
($_ seq
(test "Can write easy loops for iterative programming."
(i/= 1000
(loop [counter 0
value 1]
(if (i/< 3 counter)
(recur (inc counter) (i/* 10 value))
value))))
(test "Can create lists easily through macros."
(and (case (list 1 2 3)
(#.Cons 1 (#.Cons 2 (#.Cons 3 #.Nil)))
true
_
false)
(case (list& 1 2 3 (list 4 5 6))
(#.Cons 1 (#.Cons 2 (#.Cons 3 (#.Cons 4 (#.Cons 5 (#.Cons 6 #.Nil))))))
true
_
false)))
(test "Can have defaults for Maybe values."
(and (is? "yolo" (maybe.default "yolo"
#.None))
(is? "lol" (maybe.default "yolo"
(#.Some "lol")))))
))
"Also works with random generation of values for property-based testing."
(context: "Addition & Substraction"
(do @
[x (:: @ map <prep> rand-gen)
y (:: @ map <prep> rand-gen)]
(test ""
(and (|> x (- y) (+ y) (= x))
(|> x (+ y) (- y) (= x))))))
"By default, random tests will be tried 100 times, you can specify the amount you want:"
(context: "Addition & Substraction"
(<| (times +1234)
(do @
[x (:: @ map <prep> rand-gen)
y (:: @ map <prep> rand-gen)]
(test ""
(and (|> x (- y) (+ y) (= x))
(|> x (+ y) (- y) (= x)))))))
"If a test fails, you'll be shown a seed that you can then use to reproduce a failing scenario."
(context: "Addition & Substraction"
(<| (seed +987654321)
(do @
[x (:: @ map <prep> rand-gen)
y (:: @ map <prep> rand-gen)]
(test ""
(and (|> x (- y) (+ y) (= x))
(|> x (+ y) (- y) (= x)))))))
)}
(with-gensyms [g!context g!test g!error]
(wrap (list (` (def: #export (~ g!context)
{#..test ((~! code.text) (~ description))}
(~! (IO Test))
((~! io) (case ("lux try" ((~! io) ((~! do)
(~! r.Monad<Random>)
[]
(~ test))))
(#.Right (~ g!test))
(~ g!test)
(#.Left (~ g!error))
(..fail (~ g!error))))))))))
(def: (exported-tests module-name)
(-> Text (Meta (List [Text Text Text])))
(do macro.Monad<Meta>
[defs (macro.exports module-name)]
(wrap (|> defs
(list/map (function (_ [def-name [_ def-anns _]])
(case (macro.get-text-ann (ident-for #..test) def-anns)
(#.Some description)
[true module-name def-name description]
_
[false module-name def-name ""])))
(list.filter product.left)
(list/map product.right)))))
(def: (success-message successes failures)
(-> Nat Nat Text)
(format "Test-suite finished." "\n"
(%i (.int successes)) " out of " (%i (.int (n/+ failures successes))) " tests passed." "\n"
(%i (.int failures)) " tests failed." "\n"))
(syntax: #export (run)
{#.doc (doc "Runs all the tests defined on the current module, and in all imported modules."
(run))}
(with-gensyms [g!successes g!failures g!total-successes g!total-failures]
(do @
[current-module macro.current-module-name
modules (macro.imported-modules current-module)
tests (: (Meta (List [Text Text Text]))
(|> modules
(#.Cons current-module)
list.reverse
(monad.map @ exported-tests)
(:: @ map list/join)))]
(wrap (list (` (: (~! (IO Any))
((~! io) (exec ((~! do) (~! promise.Monad<Promise>)
[(~' #let) [(~ g!total-successes) +0
(~ g!total-failures) +0]
(~+ (|> tests
(list/map (function (_ [module-name test desc])
(` [(~ (code.text module-name)) (~ (code.symbol [module-name test])) (~ (code.text desc))])))
(list.split-all promise.parallelism)
(list/map (function (_ group)
(list (` [(~ g!successes) (~ g!failures)]) (` ((~! run') (list (~+ group))))
(' #let) (` [(~ g!total-successes) (n/+ (~ g!successes) (~ g!total-successes))
(~ g!total-failures) (n/+ (~ g!failures) (~ g!total-failures))]))))
list/join))]
(exec (log! ((~! success-message) (~ g!total-successes) (~ g!total-failures)))
((~! promise.future)
((~! io.exit) (if (n/> +0 (~ g!total-failures))
1
0)))))
[])))))))))
(def: #export (seq left right)
{#.doc "Sequencing combinator."}
(-> Test Test Test)
(do r.Monad<Random>
[left left
right right]
(wrap (do promise.Monad<Promise>
[[l-counter l-documentation] left
[r-counter r-documentation] right]
(wrap [(add-counters l-counter r-counter)
(format l-documentation "\n" r-documentation)])))))
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