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## Copyright (c) Eduardo Julian. All rights reserved.
## 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 http://mozilla.org/MPL/2.0/.
(;module: {#;doc "Tools for unit & property-based/generative testing."}
lux
(lux [compiler #+ Monad<Lux> with-gensyms]
(macro ["s" syntax #+ syntax: Syntax]
[ast])
(control functor
applicative
monad)
(concurrency [promise #+ Promise Monad<Promise>])
(data (struct [list "List/" Monad<List> Fold<List>])
[product]
[text]
text/format
[error #- fail "Error/" Monad<Error>])
(codata [io #- run])
["R" random]
[host #- try]))
## [Host]
(jvm-import java.lang.System
(#static exit [int] #io void)
(#static currentTimeMillis [] #io long))
(do-template [<name> <signal>]
[(def: #hidden <name> (IO Unit) (System.exit <signal>))]
[exit 0]
[die 1]
)
## [Types]
(type: #export Test
{#;doc "Tests are asynchronous process which may fail."}
(Promise (Error Unit)))
## [Values]
(def: #export (fail message)
(All [a] (-> Text Test))
(:: Monad<Promise> wrap (#;Left message)))
(def: #export (assert message condition)
{#;doc "Check that a condition is true, and fail with the given message otherwise."}
(-> Text Bool Test)
(if condition
(:: Monad<Promise> wrap (#;Right []))
(fail message)))
(def: #hidden (run' tests)
(-> (List [Text (IO Test) Text]) (Promise Nat))
(do Monad<Promise>
[#let [test-runs (List/map (: (-> [Text (IO Test) Text] (Promise Nat))
(lambda [[module test description]]
(do @
[#let [pre (io;run (System.currentTimeMillis []))]
outcome (io;run test)
#let [post (io;run (System.currentTimeMillis []))
description+ (:: text;Codec<Text,Text> encode description)]]
(case outcome
(#;Left error)
(exec (log! (format "Error: " description+ " @ " module "\n" error "\n"))
(wrap +0))
_
(exec (log! (format "Success: " description+ " @ " module " in " (%i (i.- pre post)) "ms"))
(wrap +1))))))
tests)]
test-runs (seqM @ test-runs)]
(wrap (List/fold n.+ +0 test-runs))))
(def: pcg-32-magic-inc Nat +12345)
(type: #export Seed
{#;doc "The seed value used for random testing (if that feature is used)."}
Nat)
(def: (try seed random-test)
(-> Seed (R;Random Test) (Promise (Error Seed)))
(let [[prng [new-seed test]] (R;run (R;pcg-32 [pcg-32-magic-inc seed])
(do R;Monad<Random>
[test random-test
next-seed R;nat]
(wrap [next-seed test])))]
(do Monad<Promise>
[result test]
(case result
(#;Left error)
(wrap (#;Left error))
(#;Right _)
(wrap (#;Right new-seed))))))
(def: (repeat' seed times random-test)
(-> Seed Nat (R;Random Test) Test)
(if (n.= +0 times)
(fail "Can't try a test 0 times.")
(do Monad<Promise>
[output (try seed random-test)]
(case output
(#;Left error)
(fail (format "Test failed with this seed: " (%n seed) "\n" error))
(#;Right seed')
(if (n.= +1 times)
(wrap (#;Right []))
(repeat' seed' (n.dec times) random-test))
))))
(def: #hidden (repeat ?seed times random-test)
(-> (Maybe Nat) Nat (R;Random Test) Test)
(repeat' (default (int-to-nat (io;run (System.currentTimeMillis [])))
?seed)
(case ?seed
#;None times
(#;Some _) +1)
random-test))
## [Syntax]
(type: Test-Config
(#Seed Nat)
(#Times Nat))
(type: Property-Test
{#seed (Maybe Test-Config)
#bindings (List [AST AST])
#body AST})
(type: Test-Kind
(#Property Property-Test)
(#Simple AST))
(def: config^
(Syntax Test-Config)
(s;alt (do s;Monad<Syntax>
[_ (s;tag! ["" "seed"])]
s;nat)
(do s;Monad<Syntax>
[_ (s;tag! ["" "times"])]
s;nat)))
(def: property-test^
(Syntax Property-Test)
($_ s;seq
(s;opt config^)
(s;tuple (s;some (s;seq s;any s;any)))
s;any))
(def: test^
(Syntax Test-Kind)
(s;alt property-test^
s;any))
(def: (pair-to-list [x y])
(All [a] (-> [a a] (List a)))
(list x y))
(def: #hidden (try-body lazy-body)
(-> (IO Test) Test)
(case (host;try (io;run lazy-body))
(#;Right output)
output
(#;Left error)
(assert error false)))
(syntax: #export (test: description [body test^])
{#;doc (doc "Macro for definint tests."
(test: "Simple macros and constructs"
($_ seq
(assert "Can write easy loops for iterative programming."
(i.= 1000
(loop [counter 0
value 1]
(if (i.< 3 counter)
(recur (i.inc counter) (i.* 10 value))
value))))
(assert "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)))
(assert "Can have defaults for Maybe values."
(and (is "yolo" (default "yolo"
#;None))
(is "lol" (default "yolo"
(#;Some "lol")))))
))
"Also works with random generation of values for property-based testing."
(test: "Addition & Substraction"
[x (:: @ map <prep> rand-gen)
y (:: @ map <prep> rand-gen)]
(assert ""
(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:"
(test: "Addition & Substraction"
#times +1234
[x (:: @ map <prep> rand-gen)
y (:: @ map <prep> rand-gen)]
(assert ""
(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."
(test: "Addition & Substraction"
#seed +987654321
[x (:: @ map <prep> rand-gen)
y (:: @ map <prep> rand-gen)]
(assert ""
(and (|> x (- y) (+ y) (= x))
(|> x (+ y) (- y) (= x)))))
)}
(let [body (case body
(#Property config bindings body)
(let [[=seed =times] (case config
#;None
[(` #;None) +100]
(#;Some (#Seed value))
[(` (#;Some (~ (ast;nat value)))) +100]
(#;Some (#Times value))
[(` #;None) value])
bindings' (|> bindings (List/map pair-to-list) List/join)]
(` (repeat (~ =seed)
(~ (ast;nat =times))
(do R;Monad<Random>
[(~@ bindings')]
((~' wrap) (;;try-body (io;io (~ body))))))))
(#Simple body)
body)]
(with-gensyms [g!test]
(wrap (list (` (def: #export (~ g!test)
{#;;test (#;TextM (~ description))}
(IO Test)
(io (~ body)))))))))
(def: (exported-tests module-name)
(-> Text (Lux (List [Text Text Text])))
(do Monad<Lux>
[defs (compiler;exports module-name)]
(wrap (|> defs
(List/map (lambda [[def-name [_ def-anns _]]]
(case (compiler;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: #hidden _appendT_ (-> Text Text Text) (:: text;Monoid<Text> append))
(def: #hidden _%i_ (-> Int Text) %i)
(syntax: #export (run)
{#;doc (doc "Runs all the tests defined on the current module, and in all imported modules."
(run))}
(with-gensyms [g!_ g!accum]
(do @
[current-module compiler;current-module-name
modules (compiler;imported-modules current-module)
tests (: (Lux (List [Text Text Text]))
(|> (#;Cons current-module modules)
list;reverse
(mapM @ exported-tests)
(:: @ map List/join)))
#let [tests+ (List/map (lambda [[module-name test desc]]
(` [(~ (ast;text module-name)) (~ (ast;symbol [module-name test])) (~ (ast;text desc))]))
tests)
num-tests (list;size tests+)
groups (list;split-all promise;concurrency-level tests+)]]
(wrap (list (` (: (IO Unit)
(io (exec (do Monad<Promise>
[(~' #let) [(~ g!accum) +0]
(~@ (List/join (List/map (lambda [group]
(list g!_ (` (run' (list (~@ group))))
(' #let) (` [(~ g!accum) (n.+ (~ g!_) (~ g!accum))])))
groups)))
(~' #let) [(~ g!_) (n.- (~ g!accum) (~ (ast;nat num-tests)))]]
(exec (log! ($_ _appendT_
"Test-suite finished."
"\n"
(_%i_ (nat-to-int (~ g!_))) " tests failed."
"\n"
(_%i_ (nat-to-int (~ g!accum)))
" out of "
(~ (|> num-tests nat-to-int _%i_ ast;text))
" tests passed."))
(promise;future (if (n.> +0 (~ g!_))
;;die
;;exit))))
[])))))))))
(def: #export (seq left right)
{#;doc "Sequencing combinator."}
(-> Test Test Test)
(do Monad<Promise>
[=left left
=right right]
(case [=left =right]
(^or [(#;Left error) _]
[_ (#;Left error)])
(wrap (#;Left error))
_
(wrap (#;Right [])))))
(def: #export (alt left right)
{#;doc "Alternative combinator."}
(-> Test Test Test)
(do Monad<Promise>
[=left left
=right right]
(case =left
(#;Right _)
(wrap =left)
_
(wrap =right))))
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