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Grunt vs Jest: What are the differences?

What is Grunt? The JavaScript Task Runner. The less work you have to do when performing repetitive tasks like minification, compilation, unit testing, linting, etc, the easier your job becomes. After you've configured it, a task runner can do most of that mundane work for you鈥攁nd your team鈥攚ith basically zero effort.

What is Jest? Painless JavaScript Unit Testing. Jest provides you with multiple layers on top of Jasmine.

Grunt and Jest are primarily classified as "JS Build Tools / JS Task Runners" and "Javascript Testing Framework" tools respectively.

"Configuration " is the primary reason why developers consider Grunt over the competitors, whereas "Open source" was stated as the key factor in picking Jest.

Grunt and Jest are both open source tools. Jest with 26.1K GitHub stars and 3.53K forks on GitHub appears to be more popular than Grunt with 11.9K GitHub stars and 1.55K GitHub forks.

According to the StackShare community, Grunt has a broader approval, being mentioned in 794 company stacks & 421 developers stacks; compared to Jest, which is listed in 263 company stacks and 150 developer stacks.

What is Grunt?

The less work you have to do when performing repetitive tasks like minification, compilation, unit testing, linting, etc, the easier your job becomes. After you've configured it, a task runner can do most of that mundane work for you鈥攁nd your team鈥攚ith basically zero effort.

What is Jest?

Jest provides you with multiple layers on top of Jasmine.
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    What are some alternatives to Grunt and Jest?
    gulp
    Build system automating tasks: minification and copying of all JavaScript files, static images. More capable of watching files to automatically rerun the task when a file changes.
    Webpack
    A bundler for javascript and friends. Packs many modules into a few bundled assets. Code Splitting allows to load parts for the application on demand. Through "loaders" modules can be CommonJs, AMD, ES6 modules, CSS, Images, JSON, Coffeescript, LESS, ... and your custom stuff.
    npm
    npm is the command-line interface to the npm ecosystem. It is battle-tested, surprisingly flexible, and used by hundreds of thousands of JavaScript developers every day.
    Yarn
    Yarn caches every package it downloads so it never needs to again. It also parallelizes operations to maximize resource utilization so install times are faster than ever.
    Gradle
    Gradle is a build tool with a focus on build automation and support for multi-language development. If you are building, testing, publishing, and deploying software on any platform, Gradle offers a flexible model that can support the entire development lifecycle from compiling and packaging code to publishing web sites.
    See all alternatives
    Decisions about Grunt and Jest
    Dschinkel Schinkel
    Dschinkel Schinkel
    Enzyme
    Enzyme
    React
    React
    JavaScript
    JavaScript
    Jest
    Jest
    Mocha
    Mocha
    #Testdrivendevelopment
    #Bdd
    #Tdd

    I use both mocha and Jest because:

    • I don't care whether teams use Jest or Mocha. But jest is way too overhyped. Most devs are writing integration tests and think that it's so much better but frankly I don't write integration tests as the way to get both design feedback and confidence when I code. I adhere to the test pyramid, not ice cream cone or the dumb "trophy"

    • I TDD, so I only ever use the "API" of test frameworks. I don't do a lot of integration tests for TDD and all the bells and whistles Jest provides you from the command-line I just don't need. And I certainly do not care about or touch Jest Snapshots, I despise them

    • My tests are fast enough because I write isolated tests with TDD, so I don't run into performance issues. Example: I write my tests in a way that I can run 300 tests in literally 1 second with mocha. So the Jest ability to pinpoint and only run those tests which are affected by code changes. I want to run all of them every time when I TDD. It's a different mindset when you TDD

    • I also mainly code in IntelliJ or WebStorm because I feel the tools in that IDE far surpass VSCode and I also love running the test UI runner in it vs. lousy command-line

    • I feel both mocha and Jest read just fine in terms of code readability. Jest might have shorter assertion syntax but I don't really care. I just care that I can read the damn test and my tests are written well and my test descriptions, as well as the code itself including constants represent business language, not technical. I care most about BDD, clean code, 4 rules of simple design, and SOLID

    • I don't like using mock frameworks so no I don't use Jest's Mocking framework. I don't have to mock a lot in my tests due to the nature of how I strive to code...I keep my design simple and modular using principals such as clean code and 4 rules of simple design. If I must mock, I create very simple custom mocks with JS

    • On the contrary to the belief that integration tests and mount are the way to go (this belief drives me absolutely crazy, especially Dodd's promoting that), I TDD with shallow & enzyme. My tests are simple. My design is driven by my tests and my tests give me quick and useful feedback. I have a course I'm working on coming out soon on TDD with React to show you how to truly test the FE and why the ice cream cone and trophy suck (you're being scammed people). Watch for that here: https://twitter.com/DaveSchinkel/status/1062267649235791873

    Don't forget to upvote this post!

    Mocha Jest JavaScript React @jsdom Enzyme #tdd #bdd #testdrivendevelopment

    See more
    Russel Werner
    Russel Werner
    Lead Engineer at StackShare | 7 upvotes 53K views
    atStackShareStackShare
    Percy
    Percy
    Happo.io
    Happo.io
    React Storybook
    React Storybook
    Enzyme
    Enzyme
    Jest
    Jest

    We use Jest because when we rebooted our "front end" stack earlier last year, we need to have a testing solution (we didn't have any front-end tests before that!). Jest is fast and convenient and it has plenty of community support behind it. It let's us run our unit tests with Enzyme and snapshot tests.

    This is an area that we are constantly reviewing to see what can be improved, both in terms of developer needs, accuracy, test maintainability, and coverage.

    I'm currently exploring using React Storybook to be the record of snapshot tests and using some online services, such as Happo.io and Percy in our CI pipeline.

    See more
    Scott Mebberson
    Scott Mebberson
    CTO / Chief Architect at Idearium | 2 upvotes 20.7K views
    Jest
    Jest
    Mocha
    Mocha

    We used to Mocha for as our primary Node.js test framework. We've now switched to Jest and haven't looked back.

    Jest is faster and requires less setup and configuration. The Mocha API and eco-system is vast and verified, but that also brings complexity.

    It you want to get in, write tests, execute them and get out, try Jest 馃榾

    See more
    Gustavo Mu帽oz
    Gustavo Mu帽oz
    Web UI Developer at Globant | 4 upvotes 15.6K views
    Parcel
    Parcel
    gulp
    gulp
    Grunt
    Grunt
    Webpack
    Webpack
    #WebPackDevServer
    #Merge

    Using Webpack is one of the best decision ever. I have used to Grunt and gulp previously, but the experience is not the same, and despite I know there are other bundlers like Parcel, Webpack gives me the perfect balance between automatization and configuration. The ecosystem of tools and loaders is amazing, and with WebPack #merge, you can modularize your build and define standard pieces to assemble different build configurations. I don't like processes where you cannot see their guts, and you have to trust in magic a little bit too much for my taste. But also I don't want to reinvent the wheel and lose too much time configuring my build processes. And of course, I love #WebPackDevServer and hot reloading.

    See more
    Gustavo Mu帽oz
    Gustavo Mu帽oz
    Web UI Developer at Globant | 1 upvotes 1.6K views
    Enzyme
    Enzyme
    Jest
    Jest

    I really enjoy using Jest as my testing framework. I also use Enzyme to complement, and both together are amazing. Jest is fast and easy to use, It has all you need together under the same tool, and it's pretty easy to create all kind of test, even asynchronous ones. I was responsible for implant it in our company projects, and it was the best decision for testing.

    See more
    Jack Graves
    Jack Graves
    Head of Product Development at Automation Consultants | 3 upvotes 24.6K views
    atAutomation ConsultantsAutomation Consultants
    Mocha
    Mocha
    Apache JMeter
    Apache JMeter
    Jest
    Jest
    JUnit
    JUnit

    We use JUnit and Jest to perform the bulk of our automated test scenarios, with additional work with Apache JMeter for performance testing - for example, the Atlassian Data Center compliance testing is performed with JMeter. Jest provides testing for the React interfaces, which make up the backend of our App offerings. JUnit is used for Unit Testing our Server-based Apps. Mocha is another tool we use.

    See more
    Robert Zuber
    Robert Zuber
    CTO at CircleCI | 15 upvotes 266K views
    atCircleCICircleCI
    Cypress
    Cypress
    Percy
    Percy
    Jest
    Jest
    Apollo
    Apollo
    GraphQL
    GraphQL
    Emotion
    Emotion
    TypeScript
    TypeScript
    Storybook
    Storybook
    React
    React
    Next.js
    Next.js

    We are in the process of adopting Next.js as our React framework and using Storybook to help build our React components in isolation. This new part of our frontend is written in TypeScript, and we use Emotion for CSS/styling. For delivering data, we use GraphQL and Apollo. Jest, Percy, and Cypress are used for testing.

    See more
    Interest over time
    Reviews of Grunt and Jest
    Review ofGruntGrunt

    Grunt is all based on configuration. Some of the configuration is well documented, and some pre-built Gruntfiles can be dropped in and work like a charm. But if you are ever in the position where you have to make any changes to your large and complicated Gruntfile, set aside a few days to work on it. The deeper you get into it, the less intuitive you will find it, and the more strange behaviors you will find from plugins with some 'automagical' undocumented configuration or behavior. If you want a build process that you can understand, and that six months from now you will still understand, you are better off using Gulp.

    Avatar of cristiangiagante
    .Net Developer at Hexacta
    Review ofJestJest

    I'm using Jest for 3 months in a Vue JS project . I need to use a lot of custom search of related topics in jest docs because it's not clear. The examples are very poor too.

    How developers use Grunt and Jest
    Avatar of Volkan 脰z莽elik
    Volkan 脰z莽elik uses JestJest

    Jest is my unit-testing tool of choice.

    Almost all unit testing suites (Mocha, Jasmine, etc.) are more or less the same.

    The main advantage I guess, is that it integrates pretty well with React and Enzyme.

    Avatar of IVS
    IVS uses GruntGrunt

    Using ES7 async/await make the whole tooling chain "problem" disappear. No more code - no grunt tasks, no problems. We don't use grunt anymore.

    Avatar of Chris Saylor
    Chris Saylor uses GruntGrunt

    We use it in development for the main application and is responsible for generating the Electron binary artifacts for the client application.

    Avatar of Cian 脫 Cuinneag谩in
    Cian 脫 Cuinneag谩in uses GruntGrunt

    Concat all javascript files, less files plus other work. Then moves all output files to build directory(declared in the build.config file).

    Avatar of Aspire
    Aspire uses GruntGrunt

    Build our client-side app: process and minify LESS, AngularJS, HTML partials, etc.

    Avatar of Giftstarter
    Giftstarter uses GruntGrunt

    We use Grunt to automate some stuff, mostly related to tasks for the the Web App.

    How much does Grunt cost?
    How much does Jest cost?
    Pricing unavailable
    Pricing unavailable