Property based testing framework for JavaScript/TypeScript
Getting started
Hands-on tutorial and definition of Property Based Testing:
๐ see tutorial. Or directly try it online on our pre-configured
CodeSandbox.
Property based testing frameworks check the truthfulness of properties. A property is a statement like:
for all (x, y, ...) such that precondition(x, y, ...) holds predicate(x, y, ...) is true.
Install the module with:
yarn add fast-check --dev
or
npm install fast-check --save-dev
Example of integration in
mocha:
import fc from 'fast-check';
// Code under test
const contains = (text, pattern) => text.indexOf(pattern) >= 0;
// Properties
describe('properties', () => {
// string text always contains itself
it('should always contain itself', () => {
fc.assert(fc.property(fc.string(), (text) => contains(text, text)));
});
// string a + b + c always contains b, whatever the values of a, b and c
it('should always contain its substrings', () => {
fc.assert(
fc.property(fc.string(), fc.string(), fc.string(), (a, b, c) => {
// Alternatively: no return statement and direct usage of expect or assert
return contains(a + b + c, b);
}),
);
});
});
In case of failure, the test raises a red flag. Its output should help you to diagnose what went wrong in your implementation. Example with a failing implementation of contain:
1) should always contain its substrings
Error: Property failed after 1 tests (seed: 1527422598337, path: 0:0): ["","",""]
Shrunk 1 time(s)
Got error: Property failed by returning false
Hint: Enable verbose mode in order to have the list of all failing values encountered during the run
Integration with other test frameworks:
ava,
jasmine,
jest,
mocha and
tape.
More examples:
simple examples,
fuzzing and
against various algorithms.
Useful documentations:
Why should I migrate to fast-check?
fast-check has initially been designed in an attempt to cope with limitations I encountered while using other property based testing frameworks designed for JavaScript:
- Types: strong and up-to-date types - thanks to TypeScript
- Extendable: easy
map
method to derive existing arbitraries while keeping shrink \[more\ - some frameworks ask the user to provide both a->b and b->a mappings in order to keep a shrinker - Extendable: kind of flatMap-operation called
chain
\[more\ - able to bind the output of an arbitrary as input of another one while keeping the shrink working - Extendable: precondition checks with
fc.pre(...)
\[more\ - filtering invalid entries can be done directly inside the check function if needed - Extendable: easily switch from fake data in tests to property based with
fc.gen()
\[more\ - generate random values within your predicates - Smart: ability to shrink on
fc.oneof
\[more\ - surprisingly some frameworks don't - Smart: biased by default - by default it generates both small and large values, making it easier to dig into counterexamples without having to tweak a size parameter manually
- Debug: verbose mode \[more\\tutorial\ - easier troubleshooting with verbose mode enabled
- Debug: replay directly on the minimal counterexample \[tutorial\ - no need to replay the whole sequence, you get directly the counterexample
- Debug: custom examples in addition of generated ones \[more\ - no need to duplicate the code to play the property on custom examples
- Debug: logger per predicate run \[more\ - simplify your troubleshoot with fc.context and its logging feature
- Unique: model based approach \[more\\article\ - use the power of property based testing to test UI, APIs or state machines
- Unique: detect race conditions in your code \[more\\tutorial\ - shuffle the way your promises and async calls resolve using the power of property based testing to detect races
- Unique: simplify user definable corner cases \[more\ - simplify bug resolution by asking fast-check if it can find an even simpler corner case
For more details, refer to the documentation in the links above.
Trusted
fast-check has been trusted for years by big projects like:
jest,
jasmine,
fp-ts,
io-ts,
ramda,
js-yaml,
query-string...
Powerful
It also proved useful in finding bugs among major open source projects such as
jest,
query-string... and
many others.
Compatibility
Here are the minimal requirements to use fast-check properly without any polyfills:
| fast-check | node | ECMAScript version |
TypeScript (optional) |
| ---------- | ------------------- | ------------------ | ----------------------- |
|
3.x | โฅ8
(1) | ES2017 | โฅ4.1
(2) |
|
2.x | โฅ8
(1) | ES2017 | โฅ3.2
(3) |
|
1.x | โฅ0.12
(1) | ES3 | โฅ3.0
(3) |
More details...
- Except for features that cannot be polyfilled - such as
bigint
-related ones - all the capabilities of fast-check should be usable given you use at least the minimal recommended version of node associated to your major of fast-check. - Require either lib or target โฅ ES2020 or
@types/node
to be installed. - Require either lib or target โฅ ES2015 or
@types/node
to be installed.
ReScript bindings
Bindings to use fast-check in
ReScript are available in package
rescript-fast-check. They are maintained by
@TheSpyder as an external project.
Contributors โจ
Thanks goes to these wonderful people (
emoji key):
<tr>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/dubzzz"><img src="https://avatars.githubusercontent.com/u/5300235?v=4?s=100" width="100px;" alt="Nicolas DUBIEN"/><br /><sub><b>Nicolas DUBIEN</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=dubzzz" title="Code">๐ป</a> <a href="https://github.com/dubzzz/fast-check/commits?author=dubzzz" title="Documentation">๐</a> <a href="https://github.com/dubzzz/fast-check/commits?author=dubzzz" title="Tests">โ ๏ธ</a> <a href="#infra-dubzzz" title="Infrastructure (Hosting, Build-Tools, etc)">๐</a> <a href="#design-dubzzz" title="Design">๐จ</a> <a href="#maintenance-dubzzz" title="Maintenance">๐ง</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/hath995"><img src="https://avatars.githubusercontent.com/u/381037?v=4?s=100" width="100px;" alt="Aaron Elligsen"/><br /><sub><b>Aaron Elligsen</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=hath995" title="Code">๐ป</a> <a href="https://github.com/dubzzz/fast-check/commits?author=hath995" title="Documentation">๐</a> <a href="https://github.com/dubzzz/fast-check/commits?author=hath995" title="Tests">โ ๏ธ</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/willheslam"><img src="https://avatars.githubusercontent.com/u/5377213?v=4?s=100" width="100px;" alt="Will Heslam"/><br /><sub><b>Will Heslam</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=willheslam" title="Documentation">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/kazchimo"><img src="https://avatars.githubusercontent.com/u/31263328?v=4?s=100" width="100px;" alt="kazchimo"/><br /><sub><b>kazchimo</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=kazchimo" title="Code">๐ป</a> <a href="https://github.com/dubzzz/fast-check/commits?author=kazchimo" title="Documentation">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/brandon-leapyear"><img src="https://avatars.githubusercontent.com/u/27799541?v=4?s=100" width="100px;" alt="Brandon Chinn"/><br /><sub><b>Brandon Chinn</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=brandon-leapyear" title="Code">๐ป</a> <a href="https://github.com/dubzzz/fast-check/commits?author=brandon-leapyear" title="Documentation">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="http://safareli.github.io/resume/"><img src="https://avatars.githubusercontent.com/u/1932383?v=4?s=100" width="100px;" alt="Irakli Safareli"/><br /><sub><b>Irakli Safareli</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=safareli" title="Documentation">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/TheSpyder"><img src="https://avatars.githubusercontent.com/u/298292?v=4?s=100" width="100px;" alt="Andrew Herron"/><br /><sub><b>Andrew Herron</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=TheSpyder" title="Documentation">๐</a> <a href="#plugin-TheSpyder" title="Plugin/utility libraries">๐</a></td>
</tr>
<tr>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/EricCrosson"><img src="https://avatars.githubusercontent.com/u/1596818?v=4?s=100" width="100px;" alt="Eric Crosson"/><br /><sub><b>Eric Crosson</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=EricCrosson" title="Documentation">๐</a> <a href="https://github.com/dubzzz/fast-check/commits?author=EricCrosson" title="Code">๐ป</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/burrscurr"><img src="https://avatars.githubusercontent.com/u/23213508?v=4?s=100" width="100px;" alt="burrscurr"/><br /><sub><b>burrscurr</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=burrscurr" title="Documentation">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://www.dijonkitchen.org/"><img src="https://avatars.githubusercontent.com/u/11434205?v=4?s=100" width="100px;" alt="JC (Jonathan Chen)"/><br /><sub><b>JC (Jonathan Chen)</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=dijonkitchen" title="Documentation">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="http://fixate.it/"><img src="https://avatars.githubusercontent.com/u/1510520?v=4?s=100" width="100px;" alt="Larry Botha"/><br /><sub><b>Larry Botha</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=larrybotha" title="Documentation">๐</a> <a href="https://github.com/dubzzz/fast-check/commits?author=larrybotha" title="Code">๐ป</a> <a href="https://github.com/dubzzz/fast-check/commits?author=larrybotha" title="Tests">โ ๏ธ</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://epa.ms/RomanGusev"><img src="https://avatars.githubusercontent.com/u/5839225?v=4?s=100" width="100px;" alt="Roman Gusev"/><br /><sub><b>Roman Gusev</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=102" title="Documentation">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://timwis.com/"><img src="https://avatars.githubusercontent.com/u/761444?v=4?s=100" width="100px;" alt="Tim Wisniewski"/><br /><sub><b>Tim Wisniewski</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=timwis" title="Documentation">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://world.hey.com/brais"><img src="https://avatars.githubusercontent.com/u/17855450?v=4?s=100" width="100px;" alt="Brais Piรฑeiro"/><br /><sub><b>Brais Piรฑeiro</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=brapifra" title="Code">๐ป</a> <a href="https://github.com/dubzzz/fast-check/commits?author=brapifra" title="Tests">โ ๏ธ</a></td>
</tr>
<tr>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/brds"><img src="https://avatars.githubusercontent.com/u/118620?v=4?s=100" width="100px;" alt="Renaud-Pierre Bordes"/><br /><sub><b>Renaud-Pierre Bordes</b></sub></a><br /><a href="#design-brds" title="Design">๐จ</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/fwip"><img src="https://avatars.githubusercontent.com/u/190414?v=4?s=100" width="100px;" alt="Jemma Nelson"/><br /><sub><b>Jemma Nelson</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=fwip" title="Documentation">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="http://fullof.bs/"><img src="https://avatars.githubusercontent.com/u/77482?v=4?s=100" width="100px;" alt="John Haugeland"/><br /><sub><b>John Haugeland</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=StoneCypher" title="Documentation">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/treydavis"><img src="https://avatars.githubusercontent.com/u/1691239?v=4?s=100" width="100px;" alt="Trey Davis"/><br /><sub><b>Trey Davis</b></sub></a><br /><a href="#design-treydavis" title="Design">๐จ</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://leonzalion.com/"><img src="https://avatars.githubusercontent.com/u/36966635?v=4?s=100" width="100px;" alt="Leon Si"/><br /><sub><b>Leon Si</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=leonzalion" title="Documentation">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="http://spion.github.io/"><img src="https://avatars.githubusercontent.com/u/502412?v=4?s=100" width="100px;" alt="Gorgi Kosev"/><br /><sub><b>Gorgi Kosev</b></sub></a><br /><a href="#infra-spion" title="Infrastructure (Hosting, Build-Tools, etc)">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/mayconsacht"><img src="https://avatars.githubusercontent.com/u/5214042?v=4?s=100" width="100px;" alt="mayconsacht"/><br /><sub><b>mayconsacht</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=mayconsacht" title="Code">๐ป</a></td>
</tr>
<tr>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/paldepind"><img src="https://avatars.githubusercontent.com/u/521604?v=4?s=100" width="100px;" alt="Simon Friis Vindum"/><br /><sub><b>Simon Friis Vindum</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=paldepind" title="Code">๐ป</a> <a href="https://github.com/dubzzz/fast-check/commits?author=paldepind" title="Tests">โ ๏ธ</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://twitter.com/gibson042"><img src="https://avatars.githubusercontent.com/u/1199584?v=4?s=100" width="100px;" alt="Richard Gibson"/><br /><sub><b>Richard Gibson</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=gibson042" title="Documentation">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://alanharper.com.au/"><img src="https://avatars.githubusercontent.com/u/475?v=4?s=100" width="100px;" alt="Alan Harper"/><br /><sub><b>Alan Harper</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=aussiegeek" title="Documentation">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/Osman-Sodefa"><img src="https://avatars.githubusercontent.com/u/90332566?v=4?s=100" width="100px;" alt="Makien Osman"/><br /><sub><b>Makien Osman</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=Osman-Sodefa" title="Code">๐ป</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/sommd"><img src="https://avatars.githubusercontent.com/u/7817485?v=4?s=100" width="100px;" alt="David Sommerich"/><br /><sub><b>David Sommerich</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=sommd" title="Code">๐ป</a> <a href="https://github.com/dubzzz/fast-check/commits?author=sommd" title="Tests">โ ๏ธ</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/diegopedro94"><img src="https://avatars.githubusercontent.com/u/7157796?v=4?s=100" width="100px;" alt="Diego Pedro"/><br /><sub><b>Diego Pedro</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=diegopedro94" title="Code">๐ป</a> <a href="https://github.com/dubzzz/fast-check/commits?author=diegopedro94" title="Tests">โ ๏ธ</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/BoruiGu"><img src="https://avatars.githubusercontent.com/u/8686167?v=4?s=100" width="100px;" alt="Borui Gu"/><br /><sub><b>Borui Gu</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=BoruiGu" title="Documentation">๐</a></td>
</tr>
<tr>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/eventualbuddha"><img src="https://avatars.githubusercontent.com/u/1938?v=4?s=100" width="100px;" alt="Brian Donovan"/><br /><sub><b>Brian Donovan</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=eventualbuddha" title="Documentation">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/volrk"><img src="https://avatars.githubusercontent.com/u/32265974?v=4?s=100" width="100px;" alt="volrk"/><br /><sub><b>volrk</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=volrk" title="Code">๐ป</a> <a href="https://github.com/dubzzz/fast-check/commits?author=volrk" title="Documentation">๐</a> <a href="https://github.com/dubzzz/fast-check/commits?author=volrk" title="Tests">โ ๏ธ</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/tinydylan"><img src="https://avatars.githubusercontent.com/u/41112113?v=4?s=100" width="100px;" alt="tinydylan"/><br /><sub><b>tinydylan</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=tinydylan" title="Code">๐ป</a> <a href="https://github.com/dubzzz/fast-check/commits?author=tinydylan" title="Tests">โ ๏ธ</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/jasikpark"><img src="https://avatars.githubusercontent.com/u/10626596?v=4?s=100" width="100px;" alt="Caleb Jasik"/><br /><sub><b>Caleb Jasik</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=jasikpark" title="Documentation">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/rulai-hu"><img src="https://avatars.githubusercontent.com/u/2570932?v=4?s=100" width="100px;" alt="Rulai Hu"/><br /><sub><b>Rulai Hu</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=rulai-hu" title="Documentation">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/afonsojramos"><img src="https://avatars.githubusercontent.com/u/19473034?v=4?s=100" width="100px;" alt="Afonso Jorge Ramos"/><br /><sub><b>Afonso Jorge Ramos</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=afonsojramos" title="Documentation">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://tjenkinson.me/"><img src="https://avatars.githubusercontent.com/u/3259993?v=4?s=100" width="100px;" alt="Tom Jenkinson"/><br /><sub><b>Tom Jenkinson</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=tjenkinson" title="Documentation">๐</a></td>
</tr>
<tr>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/phormio"><img src="https://avatars.githubusercontent.com/u/28146332?v=4?s=100" width="100px;" alt="phormio"/><br /><sub><b>phormio</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=phormio" title="Documentation">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="http://buildo.io/"><img src="https://avatars.githubusercontent.com/u/2643520?v=4?s=100" width="100px;" alt="Giovanni Gonzaga"/><br /><sub><b>Giovanni Gonzaga</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=giogonzo" title="Code">๐ป</a> <a href="https://github.com/dubzzz/fast-check/commits?author=giogonzo" title="Tests">โ ๏ธ</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://caurea.org/"><img src="https://avatars.githubusercontent.com/u/34538?v=4?s=100" width="100px;" alt="Tomas Carnecky"/><br /><sub><b>Tomas Carnecky</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=wereHamster" title="Code">๐ป</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/Djaler"><img src="https://avatars.githubusercontent.com/u/7964583?v=4?s=100" width="100px;" alt="Kirill Romanov"/><br /><sub><b>Kirill Romanov</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=Djaler" title="Code">๐ป</a> <a href="https://github.com/dubzzz/fast-check/commits?author=Djaler" title="Documentation">๐</a> <a href="https://github.com/dubzzz/fast-check/commits?author=Djaler" title="Tests">โ ๏ธ</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://giovannyg.github.io/"><img src="https://avatars.githubusercontent.com/u/5326411?v=4?s=100" width="100px;" alt="Giovanny Gonzรกlez"/><br /><sub><b>Giovanny Gonzรกlez</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=giovannyg" title="Documentation">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/markkulube"><img src="https://avatars.githubusercontent.com/u/34955942?v=4?s=100" width="100px;" alt="Mark Kulube"/><br /><sub><b>Mark Kulube</b></sub></a><br /><a href="#infra-markkulube" title="Infrastructure (Hosting, Build-Tools, etc)">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="http://www.undiscoveredfeatures.com/"><img src="https://avatars.githubusercontent.com/u/354848?v=4?s=100" width="100px;" alt="Peter Hamilton"/><br /><sub><b>Peter Hamilton</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=hamiltop" title="Code">๐ป</a></td>
</tr>
<tr>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/ChineduOzodi"><img src="https://avatars.githubusercontent.com/u/11678369?v=4?s=100" width="100px;" alt="Chinedu Ozodi"/><br /><sub><b>Chinedu Ozodi</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=ChineduOzodi" title="Documentation">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/gunar"><img src="https://avatars.githubusercontent.com/u/7684574?v=4?s=100" width="100px;" alt="Gunar Gessner"/><br /><sub><b>Gunar Gessner</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=gunar" title="Documentation">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/CSBatchelor"><img src="https://avatars.githubusercontent.com/u/18668440?v=4?s=100" width="100px;" alt="Christian Batchelor"/><br /><sub><b>Christian Batchelor</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=CSBatchelor" title="Tests">โ ๏ธ</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://tomeraberba.ch/"><img src="https://avatars.githubusercontent.com/u/23299544?v=4?s=100" width="100px;" alt="Tomer Aberbach"/><br /><sub><b>Tomer Aberbach</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=TomerAberbach" title="Code">๐ป</a> <a href="https://github.com/dubzzz/fast-check/commits?author=TomerAberbach" title="Documentation">๐</a> <a href="https://github.com/dubzzz/fast-check/commits?author=TomerAberbach" title="Tests">โ ๏ธ</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/0xflotus"><img src="https://avatars.githubusercontent.com/u/26602940?v=4?s=100" width="100px;" alt="0xflotus"/><br /><sub><b>0xflotus</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=0xflotus" title="Documentation">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/CodeLenny"><img src="https://avatars.githubusercontent.com/u/9272847?v=4?s=100" width="100px;" alt="Ryan Leonard"/><br /><sub><b>Ryan Leonard</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=CodeLenny" title="Code">๐ป</a> <a href="https://github.com/dubzzz/fast-check/commits?author=CodeLenny" title="Documentation">๐</a> <a href="https://github.com/dubzzz/fast-check/commits?author=CodeLenny" title="Tests">โ ๏ธ</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://blog.bitjson.com/"><img src="https://avatars.githubusercontent.com/u/904007?v=4?s=100" width="100px;" alt="Jason Dreyzehner"/><br /><sub><b>Jason Dreyzehner</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=bitjson" title="Code">๐ป</a> <a href="https://github.com/dubzzz/fast-check/commits?author=bitjson" title="Tests">โ ๏ธ</a></td>
</tr>
<tr>
<td align="center" valign="top" width="14.28%"><a href="https://matinzd.dev/"><img src="https://avatars.githubusercontent.com/u/24797481?v=4?s=100" width="100px;" alt="Matin Zadeh Dolatabad"/><br /><sub><b>Matin Zadeh Dolatabad</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=matinzd" title="Code">๐ป</a></td>
<td align="center" valign="top" width="14.28%"><a href="http://goo.gl/IlWG8U"><img src="https://avatars.githubusercontent.com/u/500?v=4?s=100" width="100px;" alt="Juan Juliรกn Merelo Guervรณs"/><br /><sub><b>Juan Juliรกn Merelo Guervรณs</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=JJ" title="Documentation">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/SimenB"><img src="https://avatars.githubusercontent.com/u/1404810?v=4?s=100" width="100px;" alt="Simen Bekkhus"/><br /><sub><b>Simen Bekkhus</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=SimenB" title="Documentation">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/tskj"><img src="https://avatars.githubusercontent.com/u/25415972?v=4?s=100" width="100px;" alt="Tarjei Skjรฆrset"/><br /><sub><b>Tarjei Skjรฆrset</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=tskj" title="Documentation">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="http://denisgorbachev.com/"><img src="https://avatars.githubusercontent.com/u/829578?v=4?s=100" width="100px;" alt="Denis Gorbachev"/><br /><sub><b>Denis Gorbachev</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=DenisGorbachev" title="Documentation">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="http://senocular.github.io/"><img src="https://avatars.githubusercontent.com/u/3536716?v=4?s=100" width="100px;" alt="Trevor McCauley"/><br /><sub><b>Trevor McCauley</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=senocular" title="Documentation">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="http://grantkiely.com/"><img src="https://avatars.githubusercontent.com/u/1948935?v=4?s=100" width="100px;" alt="Grant Kiely"/><br /><sub><b>Grant Kiely</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=gkiely" title="Documentation">๐</a></td>
</tr>
<tr>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/vecerek"><img src="https://avatars.githubusercontent.com/u/5737996?v=4?s=100" width="100px;" alt="Attila Veฤerek"/><br /><sub><b>Attila Veฤerek</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=vecerek" title="Code">๐ป</a> <a href="https://github.com/dubzzz/fast-check/commits?author=vecerek" title="Documentation">๐</a> <a href="https://github.com/dubzzz/fast-check/commits?author=vecerek" title="Tests">โ ๏ธ</a></td>
<td align="center" valign="top" width="14.28%"><a href="http://www.zachbjornson.com/"><img src="https://avatars.githubusercontent.com/u/469365?v=4?s=100" width="100px;" alt="Zach Bjornson"/><br /><sub><b>Zach Bjornson</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=zbjornson" title="Code">๐ป</a> <a href="https://github.com/dubzzz/fast-check/commits?author=zbjornson" title="Documentation">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/bennettp123"><img src="https://avatars.githubusercontent.com/u/1610227?v=4?s=100" width="100px;" alt="Bennett Perkins"/><br /><sub><b>Bennett Perkins</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=bennettp123" title="Documentation">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/nielk"><img src="https://avatars.githubusercontent.com/u/4980521?v=4?s=100" width="100px;" alt="Alexandre Oger"/><br /><sub><b>Alexandre Oger</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=nielk" title="Documentation">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/ej-shafran"><img src="https://avatars.githubusercontent.com/u/116496520?v=4?s=100" width="100px;" alt="ej shafran"/><br /><sub><b>ej shafran</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=ej-shafran" title="Documentation">๐</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://github.com/gruhn"><img src="https://avatars.githubusercontent.com/u/26570572?v=4?s=100" width="100px;" alt="Niklas Gruhn"/><br /><sub><b>Niklas Gruhn</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=gruhn" title="Code">๐ป</a></td>
<td align="center" valign="top" width="14.28%"><a href="https://patrickroza.com/"><img src="https://avatars.githubusercontent.com/u/42661?v=4?s=100" width="100px;" alt="Patrick Roza"/><br /><sub><b>Patrick Roza</b></sub></a><br /><a href="https://github.com/dubzzz/fast-check/commits?author=patroza" title="Code">๐ป</a></td>
</tr>
This project follows the
all-contributors specification. Contributions of any kind welcome!
Become one of themSponsors ๐ธ
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