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Jest

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Jest vs PhantomJS: What are the differences?

Jest: Painless JavaScript Unit Testing. Jest provides you with multiple layers on top of Jasmine; PhantomJS: Scriptable Headless WebKit. PhantomJS (www.phantomjs.org) is a headless WebKit scriptable with JavaScript. It is used by hundreds of developers and dozens of organizations for web-related development workflow.

Jest belongs to "Javascript Testing Framework" category of the tech stack, while PhantomJS can be primarily classified under "Headless Browsers".

Some of the features offered by Jest are:

  • Familiar Approach: Built on top of the Jasmine test framework, using familiar expect(value).toBe(other) assertions
  • Mock by Default: Automatically mocks CommonJS modules returned by require(), making most existing code testable
  • Short Feedback Loop: DOM APIs are mocked and tests run in parallel via a small node.js command line utility

On the other hand, PhantomJS provides the following key features:

  • Multiplatform, available on major operating systems: Windows, Mac OS X, Linux, and other Unices.
  • Fast and native implementation of web standards: DOM, CSS, JavaScript, Canvas, and SVG. No emulation!
  • Pure headless (no X11) on Linux, ideal for continuous integration systems. Also runs on Amazon EC2, Heroku, and Iron.io.

"Open source" is the top reason why over 24 developers like Jest, while over 12 developers mention "Scriptable web browser" as the leading cause for choosing PhantomJS.

Jest and PhantomJS are both open source tools. PhantomJS with 26.9K GitHub stars and 5.7K forks on GitHub appears to be more popular than Jest with 26.1K GitHub stars and 3.53K GitHub forks.

Repro, Glympse, and Ubiqua are some of the popular companies that use Jest, whereas PhantomJS is used by Key Location, Ghost Inspector, and Tailor Brands. Jest has a broader approval, being mentioned in 263 company stacks & 150 developers stacks; compared to PhantomJS, which is listed in 78 company stacks and 47 developer stacks.

Advice on Jest and PhantomJS
Ankur Loriya
Needs advice
on
PhantomJSPhantomJS
and
PuppeteerPuppeteer

I am using Node 12 for server scripting and have a function to generate PDF and send it to a browser. Currently, we are using PhantomJS to generate a PDF. Some web post shows that we can achieve PDF generation using Puppeteer. I was a bit confused. Should we move to puppeteerJS? Which one is better with NodeJS for generating PDF?

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Replies (2)
Recommends
PuppeteerPuppeteer

You better go with puppeteer. It is basically chrome automation tool, written in nodejs. So what you get is PDF, generated by chrome itself. I guess there is hardly better PDF generation tool for the web. Phantomjs is already more or less outdated as technology. It uses some old webkit port that's quite behind in terms of standards and features. It can be replaced with puppeteer for every single task.

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Recommends
PuppeteerPuppeteer

I suggest puppeteer to go for. It is simple and easy to set up. Only limitaiton is it can be used only for chrome browser and currently they are looking into expanding into FF. The next thing is Playwright which is just a scale up of Puppeteer. It supports cross browsers.

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Decisions about Jest and PhantomJS
Shared insights
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CypressCypressJestJest

As we all know testing is an important part of any application. To assist with our testing we are going to use both Cypress and Jest. We feel these tools complement each other and will help us get good coverage of our code. We will use Cypress for our end to end testing as we've found it quite user friendly. Jest will be used for our unit tests because we've seen how many larger companies use it with great success.

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Postman will be used to do integration testing with the backend API we create. It offers a clean interface to create many requests, and you can even organize these requests into collections. It helps to test the backend API first to make sure it's working before using it in the front-end. Jest can also be used for testing and is already embedded into React. Not only does it offer unit testing support in javascript, it can also do snapshot testing for the front-end to make sure components are rendering correctly. Enzyme is complementary to Jest and offers more functions such as shallow rendering. UnitTest will be used for Python testing as it is simple, has a lot of functionality and already built in with python. Sentry will be used for keeping track of errors as it is also easily integratable with Heroku because they offer it as an add-on. LogDNA will be used for tracking logs which are not errors and is also a Heroku add-on. Its good to have a separate service to record logs, monitor, track and even fix errors in real-time so our application can run more smoothly.

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Pros of Jest
Pros of PhantomJS
  • 35
    Open source
  • 31
    Mock by default makes testing much simpler
  • 22
    Testing React Native Apps
  • 19
    Parallel test running
  • 15
    Fast
  • 13
    Bundled with JSDOM to enable DOM testing
  • 8
    Mock by default screws up your classes, breaking tests
  • 7
    Out of the box code coverage
  • 6
    Promise support
  • 6
    One stop shop for unit testing
  • 3
    Great documentation
  • 2
    Assert Library Included
  • 1
    Built in watch option with interactive filtering menu
  • 1
    Preset support
  • 0
    Karma
  • 0
    Can be used for BDD
  • 13
    Scriptable web browser
  • 3
    Depends on QT
  • 2
    No ECMAScript 6

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Cons of Jest
Cons of PhantomJS
  • 3
    Ambiguous configuration
  • 3
    Difficult
  • 3
    Documentation
  • 2
    Many bugs still not fixed months/years after reporting
  • 2
    Multiple error messages for same error
  • 2
    Difficult to run single test/describe/file
  • 2
    Ambiguous
  • 2
    Bugged
  • 1
    Slow
  • 1
    Reporter is too general
  • 1
    BeforeAll timing out makes all passing tests fail
  • 1
    Unstable
  • 1
    Bad docs
  • 1
    Still does't support .mjs files natively
  • 1
    Can't fail beforeAll to abort tests
  • 0
    Interaction with watch mode on terminal
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    What is Jest?

    Jest provides you with multiple layers on top of Jasmine.

    What is PhantomJS?

    PhantomJS is a headless WebKit scriptable with JavaScript. It is used by hundreds of developers and dozens of organizations for web-related development workflow.

    Need advice about which tool to choose?Ask the StackShare community!

    Jobs that mention Jest and PhantomJS as a desired skillset
    CBRE
    United States of America Texas Richardson
    CBRE
    United States of America Texas Richardson
    CBRE
    United States of America Texas Richardson
    CBRE
    United States of America Texas Richardson
    CBRE
    United States of America Massachusetts Boston
    CBRE
    United States of America Texas Richardson
    CBRE
    United States of America Texas Richardson
    What companies use Jest?
    What companies use PhantomJS?
    See which teams inside your own company are using Jest or PhantomJS.
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    What tools integrate with Jest?
    What tools integrate with PhantomJS?

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    What are some alternatives to Jest and PhantomJS?
    Mocha
    Mocha is a feature-rich JavaScript test framework running on node.js and the browser, making asynchronous testing simple and fun. Mocha tests run serially, allowing for flexible and accurate reporting, while mapping uncaught exceptions to the correct test cases.
    Selenium
    Selenium automates browsers. That's it! What you do with that power is entirely up to you. Primarily, it is for automating web applications for testing purposes, but is certainly not limited to just that. Boring web-based administration tasks can (and should!) also be automated as well.
    AVA
    Even though JavaScript is single-threaded, IO in Node.js can happen in parallel due to its async nature. AVA takes advantage of this and runs your tests concurrently, which is especially beneficial for IO heavy tests. In addition, test files are run in parallel as separate processes, giving you even better performance and an isolated environment for each test file.
    Enzyme
    Enzyme is a JavaScript Testing utility for React that makes it easier to assert, manipulate, and traverse your React Components' output.
    Jasmine
    Jasmine is a Behavior Driven Development testing framework for JavaScript. It does not rely on browsers, DOM, or any JavaScript framework. Thus it's suited for websites, Node.js projects, or anywhere that JavaScript can run.
    See all alternatives