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What are the best JavaScript unit testing frameworks?
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Aug 8, 2022
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7
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Best JavaScript unit testing frameworks
Price
GZipped size
Last Updated
61
Mocha
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Aug 8, 2022
55
Jest
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Jun 4, 2022
42
Jasmine
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Aug 28, 2020
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Cypress
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Aug 1, 2022
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tape
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Oct 10, 2017
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61
Mocha
My Rec
ommendation
for
Mocha
My Recommendation for
Mocha
All
9
Pros
7
Cons
2
Top
Pro
•••
Supports different assertion libraries
Mocha runs independently from the assertion library, so you can choose which assertion format works best for you. Mocha most often is run in combination with assertion library Chai.
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Top
Con
•••
Can be intimidating for beginners
While some testing frameworks are complete out of the box, Mocha requires developers to select and set up assertion libraries and mocking utilities. For someone who is just starting to learn how to build tests this can be scary as they will also have to choose which libraries to use and learn them too.
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Top
Pro
•••
Write tests with Behavior Driven Development (BDD)
Allows developers to choose their development process. Not only TDD but also BDD.
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Top
Con
•••
No atomic tests
Tests cannot be ran in random order.
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Top
Pro
•••
Runs in Node.js and the browser
Mocha has a browser build as well as a node command line program so you can test in client and server side environments.
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Top
Pro
•••
Makes Asynchronous testing extremely easy
No need to write tricky statements for Async testing. Mocha gives you a done callback. Place this done parameter in your callback function, that'll let Mocha know that you've written an asynchronous function.
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Top
Pro
•••
Integrates really well with NodeJS
The Mocha test framework itself runs on NodeJS, hence it makes everything related to it extremely simple. With Mocha's simple syntax and speed, testing your node.js app just got a whole lot easier.
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Top
Pro
•••
Custom full color test reporters
Mocha has multiple test reporters built in and you can create your own as well. The test reporters have full color and makes it easy to see if your tests fail or not.
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Top
Pro
•••
Easy to add support for Generators
Aside from the numerous benefits with generators in your application, You can now also integrate generators into your test suite. By using mocha, all you have to do is enable support for generators.
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31
1
55
Jest
My Rec
ommendation
for
Jest
My Recommendation for
Jest
All
8
Experiences
3
Pros
4
Cons
1
Top
Pro
•••
Easy to use
One of Jest's philosophies is to provide an integrated “zero-configuration” experience. Eg: it provides assertion library by default.
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Top
Con
•••
Not beginner-friendly
If you're new to unit testing and are trying to understand unit testing within the React ecosystem, specifically ReactNative, it is going to be a challenge. The Jest doc dives right into making tests without any primer on how to go from concept to implementation.
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ArticulateArinniti's Experience
First implementation was hard to implement but the newer versions are a breeze to integrate
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Top
Pro
•••
Well documented
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CalmParjanya's Experience
4
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Top
Pro
•••
Recommended for React testing
Jest is the recommended unit testing framework by Facebook. It's also the one used by Facebook developers when working with React projects.
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Grant Carthew's Experience
Easy to learn and easy to use.
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Top
Pro
•••
Snapshot testing is convinient
It's great for testing UI. It is also convenient for asserting complex data objects, as it doesn't require developers to manually compose the expected value.
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Recommend
30
42
Jasmine
My Rec
ommendation
for
Jasmine
My Recommendation for
Jasmine
All
7
Pros
6
Cons
1
Top
Pro
•••
Has a very readable and user-friendly syntax
Code readability is an important factor, if the application development involves multiple teams; if the testing team is unable to read your test cases then they won't be able to test it. Jasmine resolves this issue by providing developers with an extremely simple and "human-friendly" syntax.
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Top
Con
•••
Not much room for flexibility
Jasmine comes with everything already baked in (including assertion libraries and mocking utilities). While this is great for beginners and people who don't want to spend much time looking into different libraries and tools it can be a turnoff for anyone who wants to use a different assertion and/or mocking library.
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Pro
•••
Includes assertions and mocking
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Top
Pro
•••
Behaviour Driven Development focused
If you prefer your test cases and application to be developed from the perspective of your stake holders, Jasmine is the framework for you.
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Top
Pro
•••
Allows both DOM-less as well as Asynchronous testing
If you have some test cases that do not involve testing of DOM elements or events, those are exactly the ones where you want to use Jasmine. It'll provide smooth, simple and easy DOM-less testing of those test cases.
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Top
Pro
•••
Supported by many CI servers (TeamCity, Codeship, etc.)
and some that don’t support natively have plugins (jenkins has a maven plugin) Descriptive syntax for BDD paradigm
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Pro
•••
Integrates very well with Ruby on Rails
The jasmine-rails gem allows you to run Jasmine specs in a browser (powered by Rails engine mounted into your application).
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14
9
--
Cypress
My Rec
ommendation
for
Cypress
My Recommendation for
Cypress
All
1
Pros
1
Top
Pro
•••
Cross browser testing
See here. Supports: Chrome Firefox Edge Electron Brave
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Recommend
3
--
tape
My Rec
ommendation
for
tape
My Recommendation for
tape
All
5
Pros
4
Cons
1
Top
Pro
•••
Simple API
Very simple API that doesn't require globals, or monkey patching objects for assertions.
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Top
Con
•••
No concurrency
Cannot run async test cases concurrently for faster test builds.
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Top
Pro
•••
Built-in assert
This way you don't have to add more dependencies and external assertion libraries.
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Top
Pro
•••
No global functions
Tape does not use global methods such as "it", "describe", since they are not considered best practice in JavaScript.
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Top
Pro
•••
It follows the principles of TAP
TAP: Test Anything Protocol
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7
--
QUnit
My Rec
ommendation
for
QUnit
My Recommendation for
QUnit
All
5
Pros
3
Cons
2
Top
Con
•••
Doesn't support source maps
QUnit has no support for sourcemaps.
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Top
Pro
•••
Tests run in the order they're added to the suite
If you want your tests to run in the order you have provided (maybe if your tests are ordered in such a way that your current test relies on the previous one), you can do so by setting QUnit.config.reorder = false and the tests will run in the order that you have provided.
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Top
Con
•••
Testing of Async operations can be a little tough at times
QUnit expects you to call start() before an async function and stop() once it has stopped. This can be problematic when you have no way of knowing when exactly your function will start or stop.
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Top
Pro
•••
Works really well if performing DOM Testing
All frontend developers already know the ease that jQuery framework has brought to their lives, in handling DOM events and accessing elements. Since Qunit was built as a part of jquery (is even used by jQuery itself for unit testing) hence it makes testing of DOM elements a lot easier.
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Top
Pro
•••
Extremely easy to start from scratch
All you have to do is to include the QUnit library either from the CDN or from the local server and then create your testcases.js file and run it. The outputs will be displayed in a nice format in the browser.
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1
1
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Ava
My Rec
ommendation
for
Ava
My Recommendation for
Ava
All
4
Pros
4
Top
Pro
•••
Atomic tests
You can run tests in random order.
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Top
Pro
•••
No globals
Doesn't use globals.
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Top
Pro
•••
Promise support
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Pro
•••
Isolated tests
Each test is run in it's own environment.
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2
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React
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React
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React
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chai
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chai
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chai
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