Test execution results, including code coverage, are displayed and updated in realtime right where you need to see them — in your code editor, next to the line of code that you're editing. Say goodbye to context switching.
The tool is insanely fast because it calculates and runs the minimum set of tests affected by your code changes; often only a single test needs to be run. No other testing tool is capable of operating on this level.
There is no vendor, API or framework lock-in when using Wallaby.js, because the tool is a plugin for your existing testing/UI framework and IDE. You will always be able to run your tests without Wallaby.js if you need to.
Choose your weapons
For your React application, Wallaby can run your Jest tests in VS Code faster, provide a debugging experience that has been designed for your tests that works more efficiently, and provide realtime granular test results that are more helpful.
efficiency without wallaby
efficiency with wallaby
Tests run immediately as you type, on unsaved changes, in parallel if required; no need to do anything manually. Wallaby knows how your code and tests relate, so after a change only the minimum set of tests need to re-run; no other tool is capable of operating like this. No matter how large your project grows, feedback is almost instant.
Time Travel Debugging
Move forward and backwards through your code to understand the conditions that led to a specific bug. Wallaby's Time Travel Debugger accelerates your edit, compile and debug loop by allowing you to jump to a specific line of code, view runtime values, edit-and-continue and step into, over and out of your code.
Wallaby's Smart Start and Exclusive Test Run features allow running only the test files that you are currently working on. When opening or editing test files, Wallaby will start running them. Running a limited set of tests is usually many times faster than running all tests within your project and provides a highly productive workflow.
Inspect the code that your test is executing in a single logical view. Wallaby's Test Story Viewer allows you to see your test execution trace without having to jump between multiple functions or code files. It is ideal for both reading and debugging code. Quickly see covered lines of code, step into, over and out of your code, and view runtime values.
Inline Runtime Values
See the results of console.log and runtime variables in your editor, right next to your code. Show and copy expression values with editor commands, accessible using keyboard shortcuts. Wallaby's special comment format can also be used to evaluate expressions and includes the ability to measure code execution times.
Inline Error Reporting
Error messages are displayed right next to the code that caused them. Gutter indicators show if the current line of code is the source of an error, or if it's on the execution path of a failing test or error. Editor commands (with keyboard shortcuts) allow you to quickly navigate to the associated failing test or error source.
Inline Code Coverage
Indicators in the gutter of your code editor are constantly updated in realtime to display test coverage so you can quickly see which lines of code are fully covered, only partially covered or not covered at all. Editor commands can be used to toggle uncovered regions to see exactly which parts of your code have not been executed.
Test and Coverage Explorer
A strategic-level view of your project's tests and code coverage is available through Wallaby's locally hosted web application. Open files in your editor from your browser as you explore your tests and code-coverage. Sort and filter by name, duration, passing / failing tests, and code coverage. You can also exclude code from coverage calculations.
Wallaby's Test Profiler allows you to quickly record a test's CPU usage profile to analyze its runtime performance. In addition to your own test and code files, your external dependencies code is also profiled. You can quickly navigate to a section of code you want to review by clicking on the hotspot in the profile viewer.
Wallaby's Output Inspector provides an ergonomic and convenient way of inspecting logged values and errors details in a rich editor-friendly manner. Information is displayed in a code editor window, providing rich keyboard support and allowing you to stay in your coding mindset so that you don't lose your flow.
Runtime Value Explorer
Wallaby's Value Explorer allows non-primitive runtime values to be viewed and explored in an easy-to-navigate real-time treeview. This feature is great for exploring larger objects and makes debugging with Wallaby easier and faster. The tree can be expanded to any depth and paths / values can be copied directly to the clipboard.
Interactive Tests Output
Test execution results are ergonomically displayed in your editor's output window. All tests that are currently failing are listed, along with errors, diffs/snapshots, error stacks and any console.log calls. The output window's hyperlinks allow you to navigate directly to files in your editor, for example to the exact error line, or to a broken test.
Enhanced Diffs & Snapshots
When errors contain expected vs. actual values, Wallaby displays compact diffs in editor hover tips and in Wallaby's output window. A command allows you to see the diff in a side-by-side view. Jest snapshot test support includes editor commands to update snapshots for your current test, current file, or your entire project.
How much will Wallaby help me?
We estimate that using Wallaby's basic features alone will make your coding 10.84% more efficient and will save you $2396 per year.
But don't take our word for it. See what our customers have to say below and try it for free to see for yourself.
10,000+ companies all over the world, including many Fortune 500 companies, have increased their productivity and output by using Wallaby.js.
Love writing tests but don't do it enough. It is so satisfying when all tests seem to cover all corner cases and pass. To make me write more tests I purchased a license for @wallabyjs because it makes writing tests even more satisfying and faster and gives you quick overviews.— Tim-Hinnerk Heuer (@geekdenz) November 4, 2020
Can confirm. I use Quokka (and Wallaby) daily and GitHub Copilot is like a turbocharger for this. 🤯 Indeed! https://t.co/mLSo8BJ6QM— Idan Gazit (@idangazit) July 2, 2021
Reminder that @wallabyjs is probably the most useful testing tool in the JS ecosystem.— Dave Brotherstone (@bruderstein) May 12, 2021
The tool is first rate, but the support they offer is first class too.
(I have no affiliation with them, I just love it)
I can't stress enough how @wallabyjs (and Quokka.js) have been useful for the last project I've been working on. It feels like having a conversation with the code instead of fighting it.— pcostesi (@pcostesi) October 2, 2020
Yes @wallabyjs is great for many reasons. One reason that is never mentioned is that it implicitly teaches Unit Testing and Test-driven Development. No amount of books, videos or tutorials on Unit Testing will do for you or your mentees what 1 week with Wallaby will do.— Vim with your soul like ether (@joeldpalmer) October 21, 2020
@wallabyjs is what coding should be more like. My brain both hurts and rejoices at the time-traveling into the future it does while using it. Seriously a game changer!— Gregor (@watware) November 28, 2021
Next time you are in test writing mode get yourself that Wallaby trial. I'm sure you'll buy it afterwards
To be honest, I used to think TDD was just a good idea in theory, but never had enough time to really use it on my work projects. That changed when I started using Wallaby.js. #DEVCommunity https://t.co/ZM4sKS0GCD— DEV Community 👩💻👨💻 (@ThePracticalDev) July 19, 2020
Big up to the @wallabyjs team, your product rocks! What a bliss to have the live tests feedbacks when you practice TDD 🤩— Stanislas Bernard (@bernanstard) October 23, 2019
Loving your work, you might enter my top-3 annual best spendings competition 🤑 pic.twitter.com/tki5ccM8go
Just tried Wallaby.js and Im a instafan. It needs a bit of configuration (but they have updated repos with sample configurations to get you up and running) but the feedback loop it generates while writting tests/TDD is just amazing.— Jose 'Joshi' Raez 🏳️🌈 (@JoshiRaez) June 24, 2019
Now I need this for every language plz.
Wow, I love https://t.co/gnAYShEBEg. It's probably saved me the more than the cost of a license over the past couple days! Guess it's time to buy it.— abendigo (@abendigo) January 16, 2020
Just wish it could gracefully borrow #ncrunch's "break into first broken covering test at this line" feature.
Coding with @wallabyjs easily cut my development-to-complete time in half. Can't recommend it enough.— Sean Matheson (@controlplusb) April 4, 2016
Wallaby.js is one of the most absolutely awesome development tools I've ever used. Instant test feedback and editor integration, plus displaying assignment values per-line, and performance all in one. I'll never be able to live without this. https://t.co/qr8n0JeXPl— Brian Bugh (@brainbag) June 19, 2018
Yes, I write tests, a lot. Both unit tests using jest and integration/e2e using Cypress. Of great help is a tool called WallabyJS (it costs money, but I'm not benefiting from telling you). WallabyJS is a continuous test runner that turns writing test into a dopamine rush⚡️! pic.twitter.com/DhZDtytU0p— Wilgert Velinga (@Wilgert) April 17, 2020
I've spent a lot of time using @wallabyjs over the last few days. Such a productivity boost! If you haven't tried it yet, you really should!— Andrew Van Slaars (@avanslaars) September 15, 2017
Success! Got the in-principle go ahead to roll out @wallabyjs at my new company!— Steve Greatrex (@SteveGreatrex) February 15, 2018
Wallaby is incredible, and an astonishing productivity booster. I love it so much. If you haven't tried it, go go go. https://t.co/i4sETovwXm— Tim Perry (@pimterry) January 30, 2020
There is Fast 🏇— Nicolas Carlo - @firstname.lastname@example.org (@nicoespeon) January 26, 2023
And there is Wallaby-Fast 🏎️ ⚡
Here I got test status, coverage, and logs right into my VS Code as I'm typing!
Have you tried it yet? pic.twitter.com/l0uwWnE7NW
Going to heavily use @wallabyjs /quokka to show live results of examples. Such an amazing tool.— 🎙️ johnlindquist 🎙️ (@johnlindquist) June 18, 2018
Just ordered a @wallabyjs + Quokka.js licence after a 15 days trial 🥳. These tools are so good ! How can we work without them 🙃 ?— Raphaël Moreau 🚀 (@rphlmr) March 12, 2020
I have said this a bunch of times already. It stills needs a shoutout at least once a year.@wallabyjs adds so much productivity. Such a useful tool!— Thomas Sattlecker (@ThomasS09) August 22, 2019
Using @wallabyjs has to be one of the best developer experience I've felt in quite a long time. Awesome! Wish I learned about it sooner.— Jean-Philippe Sirois (@veksenn) May 9, 2018
And I love using @wallabyjs when unit testing . It is truly game changing— Jonathan Marbutt (@jmarbutt) June 11, 2019
I struggled for days trying to get a clean unit testing experience for Typescript. Finally tried @wallabyjs and got it working immediately and exactly what I wanted. All I do is open source dev but my time (and sanity) is well worth the price— Phil Scott (@Philco78) June 22, 2018
Just renewed my @wallabyjs license. One of the best tools I've used, would not want to code without it 😃🙏— Adrian Fâciu 🤘 (@adrianfaciu) December 4, 2018
@wallabyjs Just renewed my licence after (nearly) daily use for a year. You’ve made unit testing easy. Thanks & keep up the good work :)— Josh White (@__JoshWhite) May 3, 2019
Hold your horses! I’m writing my second JS test now. My new year’s resolution is taking action. #wallabyjs— Vidar Aune Westrum (@Virrum) January 8, 2019
If your new company is doing TDD, and you guys are not using @wallabyjs, you are definitely missing out! Look into it and spread the word in your team, you’ll be the new hero! The cost of licence is nothing compared to the productivity boost! pic.twitter.com/2NKkbHiwKy— Daniel Ormeño (@danielormeno) April 6, 2019
I use @wallabyjs, it works great in VS Code (our unit tests themselves are mocha and chai).— Mark Kawakami (@skippykawakami) April 16, 2019
Worked on reducing down the 30 second wait for 1800 angular unit tests to run in Karma. Got it down to, well, instant with @wallabyjs :D— Andrew Shelton (@Sheltonial) March 4, 2015
Nice. For me the best tool is @wallabyjs. I can highly recommend it 😉— Simon Hoss (@simonhoss88) May 27, 2019
Since I've bought @wallabyjs my code coverage went sky-high. Never thought that this would happen.— Damian Kamiński (@_dkaminski_) March 21, 2016
This is such an amazing tool, I use it every day and it keeps getting better https://t.co/JSbJVwGfXQ— Dave Taylor (@davetayls) July 26, 2017
WallabyJS just gave me super powers.https://t.co/b9wEC7mIDR— Matthew Thornton (@Thornton_Matt) March 20, 2016
im only writing tests because @wallabyjs is awesooome :)— Arnelle Balane (@arnellebalane) March 4, 2016
I believe that I have to mention at least once a month how freaking awesome @wallabyjs is. Been working with it for 2 years and still love it every day. Worth every penny and great support. Thx @ArtemGovorov— Brecht Billiet (@brechtbilliet) December 13, 2017
Oh yeah! We use it in every @strongbrew_io workshop so far! #tdd
Do you write React components?— Seth Blanchard (@SethBlanchard) December 5, 2019
Do you unit test* them?
If so you might want to check Wallabyjs - https://t.co/SFYoUCGlsq
It has made my test writing significantly faster (and more fun!)
*I'm not fanatical about unit testing - sometimes I find it helpful
WallabyJS is beautiful.— Jared McCluskey (@Kluskey) May 23, 2019
For me barrier to doing TDD has always been better tooling esp in large projects, @wallabyjs however has changed that for me— Nimesh Gurung (@nimgrg) October 4, 2016
Just bought my @wallabyjs freedom licence. Its rare that a tool can have such a big impact on my workflow so quickly, I highly recommend it!— James Henry (@MrJamesHenry) July 26, 2016
the time has come to renew my @wallabyjs license. I have never spend $100 so happily. It remains my most important tool!— Dave Benjamin (@zpydee) April 6, 2017
@wallabyjs Seriously great tool, esp running only changed tests/code. I have 1000+ tests & Karma was beginning to be really slow. Thanks.— Christopher Carson (@chriscarson) December 11, 2016
Well damn, @wallabyjs is just plain awesome for JS testing and coverage. They can expect to sell us a bunch of licenses soon!— Hilke Heremans (@HHeremans) January 28, 2016
I love your work! Doing original work on a field that's been pretty much stagnant since black/green screens were cool. 🙌— Nir Benita (@NirBenita) March 29, 2017
. @wallabyjs is turning into the killer app for me in VS Code. Makes writing tests so much easier. Plus the visibility of test coverage it gives me in a huge enterprise test suite makes me feel like Sauron (in a good way of course!) pic.twitter.com/eeLj72xNSc— Ben Smith (@8ensmith) April 19, 2021
Since I bought WallabyJs license. I'm a happier developer— Cristian Echeverria (@cecheverri4) April 13, 2021
Wallaby + React Testing Library = 🚀
Receive immediate feedback on your test coverage is great! I'm a spoiled dev.
If you're a Frontend Dev, go and do yourself a favor! https://t.co/sPDMct58aN
shout out to @wallabyjs Would have been even more difficult without the "INSTA-REPL" within the ide. Honestly, I think this has been my most favorite ide plugin in years!— λ fp-apprentice (@fp_apprentice) April 7, 2021
Been leaning on @wallabyjs recently. The inline symbols shown per test exposed some amazing optimisation opportunities (and a few bugs). 🤘— Sean Matheson (@controlplusb) October 30, 2017
First time of using @wallabyjs all day long at my professional work. Just DOPE! Works like a charm w/TypeScript,ES6,Mocha,Sinon,Chai,Atom.io— Jens Krause (@sectore) September 2, 2015
I just did a decently complex refactor on my JS app — and using wallaby.js made it 10x faster.— Bryan Mills (@diffkid) August 12, 2015
Just started using @wallabyjs for the first time in a js based web project and it is incredible!!!— Mob Mentality Show (@mob__mentality) June 30, 2021
The test, error, and log feedback is instantaneous just like @remcomulder's NCrunch.
Development productivity in our #mobProgramming skyrocketed today🚀
That moment you realise you've forgotten to start @wallabyjs and you've been wasting your time by manually running your unit tests.— Rich Somerfield (@richie5um) November 18, 2016
Most impressive JS test runner I've seen. http://t.co/93a7KYmjxC Worth a good look.— Shawn McKay (@Sh_McK) June 21, 2015
WOW.. 1 minute into @wallabyjs and I'm reeaaally impressed. Now for some Babel ES6/7 preprocessing— Einar Ingebrigtsen (@EinarI) June 18, 2015
Man, @wallabyjs is a great test runner. Good support too. 2 hours from initial bug report to them pushing a fix live. :)— Cody Hatch (@Codayus) June 17, 2015
Huge thank you to @AngularDutch and @wallabyjs for the Wallaby license! Gave it a spin, it's both so awesome and useful to see test status & info directly in-line, as you code. And the integrated output is also extremely helpful 🥳— Marian Stoica (@MrnStoica) December 2, 2020
Billion might be pushing it but @wallabyjs is a nice player in the commercial extension space to watch out for.— Peter Cooper (@peterc) December 3, 2020
Check out https://t.co/OxR8W1jh67 (LIVE unit test feedback in your IDE) if you want to take this feeling to the next level.— Peter Friese 🥑 (@peterfriese) January 22, 2023
Been messing around with the @wallabyjs license I won at last week's @AngularDutch meetup and I have to say I'm quite impressed by it. It might even make me pick up @code more often, maybe Vim integration someday? Thanks, folks! Looking forward to tonight's meetup.— Joris Kraak (@joriskraak) December 17, 2020
Pretty impressed by Wallaby.js and Quokka.js based on this video. Definitely will give it a try! https://t.co/W8bZSyDDTP— Johannes Schickling (@schickling) December 19, 2020