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Frontend Development
What are the best JavaScript unit testing frameworks for frontend applications?
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7
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Best JavaScript unit testing frameworks for frontend applications
Price
Last Updated
54
Mocha
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Jun 23, 2021
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Jest
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Jun 23, 2021
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Jasmine
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Feb 6, 2018
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tape
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Jun 19, 2019
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Cypress
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Mar 2, 2020
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54
Mocha
My Rec
ommendation
for
Mocha
My Recommendation for
Mocha
All
8
Pros
7
Cons
1
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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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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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
•••
Write tests with Behavior Driven Development (BDD)
Allows developers to choose their development process. Not only TDD but also BDD.
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Pro
•••
Integrates really well with Node.js
The Mocha test framework itself runs on Node.js, 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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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
•••
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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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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21
--
Jest
My Rec
ommendation
for
Jest
My Recommendation for
Jest
All
6
Pros
5
Cons
1
Top
Pro
•••
Natively supports mocking
Jest has out-of-the box support for mocking functions. This is extremely helpful when you want to test asynchronous functions in a completely synchronous way.
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Top
Con
•••
The official documentation is hard to understand
Like almost everything else release by Facebook (unfortunately), Jest has terrible documentation. It has a very basic example where everything is explained poorly. It doesn't explain most concepts or how everything fits together.
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Pro
•••
Well documented
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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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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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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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10
1
--
Jasmine
My Rec
ommendation
for
Jasmine
My Recommendation for
Jasmine
All
4
Pros
3
Cons
1
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
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
•••
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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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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6
--
tape
My Rec
ommendation
for
tape
My Recommendation for
tape
All
1
Experiences
1
Dmitri Zaitsev's Experience
Minimal setup with no unnecessary bloat.
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1
--
Cypress
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ommendation
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Cypress
My Recommendation for
Cypress
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Recommend
2
--
QUnit
My Rec
ommendation
for
QUnit
My Recommendation for
QUnit
All
4
Pros
3
Cons
1
Top
Pro
•••
Extremely easy to start from scratch
All you have to do is to include the QUinit library either from the CDN or from the local server and then create your tesctases.js file and run it. The outputs will be displayed in a nice format in the browser.
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Con
•••
Doesn't support source maps
QUnit has no support for sourcemaps.
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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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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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2
1
--
Intern
My Rec
ommendation
for
Intern
My Recommendation for
Intern
All
1
Pros
1
Top
Pro
•••
Gives information on which parts of the code are left untested
Intern comes with several different integrated code coverage tools which help you determine which parts of your application are left untested.
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