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Chai vs Cypress: What are the differences?

Chai: A BDD / TDD assertion library. It is a BDD / TDD assertion library for node and the browser that can be delightfully paired with any javascript testing framework. It has several interfaces that allow the developer to choose the most comfortable. The chain-capable BDD styles provide an expressive language & readable style, while the TDD assert style provides a more classical feel; Cypress: Better, faster, and more reliable testing for anything that runs in a browser. Cypress is a front end automated testing application created for the modern web. Cypress is built on a new architecture and runs in the same run-loop as the application being tested. As a result Cypress provides better, faster, and more reliable testing for anything that runs in a browser. Cypress works on any front-end framework or website.

Chai and Cypress belong to "Javascript Testing Framework" category of the tech stack.

Chai is an open source tool with 6.39K GitHub stars and 575 GitHub forks. Here's a link to Chai's open source repository on GitHub.

CircleCI, Intuit, and RELEX Solutions are some of the popular companies that use Cypress, whereas Chai is used by BeatSense, Brainhub, and Clovis. Cypress has a broader approval, being mentioned in 60 company stacks & 45 developers stacks; compared to Chai, which is listed in 6 company stacks and 8 developer stacks.

Advice on Chai and Cypress
Yildiz Dila
testmanager/automation tester at medicalservice | 5 upvotes 路 194.4K views
Needs advice
on
CypressCypress
and
ProtractorProtractor

In the company I will be building test automation framework and my new company develops apps mainly using AngularJS/TypeScript. I was planning to build Protractor-Jasmine framework but a friend of mine told me about Cypress and heard that its users are very satisfied with it. I am trying to understand the capabilities of Cypress and as the final goal to differentiate these two tools. Can anyone advice me on this in a nutshell pls...

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Replies (2)
Kevin Emery
QE Systems Engineer at Discovery, Inc. | 4 upvotes 路 105.6K views

I've used both Protractor and Cypress extensively. Cypress is the easier and more reliable tool, whereas Protractor is the more powerful tool. Your choice of tool should depend on your specific testing needs. Here are some advantages and disadvantages of each tool:

Cypress advantages:

  • Faster

  • More reliable (tends to throw fewer intermittent false failures)

  • Easier to read code (handles promises gracefully)

Cypress disadvantages:

  • Cannot switch between browser tabs

  • Cannot switch to iFrames

  • Cannot specify clicks or keypresses explicitly as if a real user was interacting

  • Cannot move the mouse to specific co-ordinates

  • Sometimes has trouble switching between different top-level domains, so not good for testing external links

  • Cypress is a newer tool with less extensive documentation and less community support

Protractor advantages:

  • More powerful because it is Selenium-based - it can switch between tabs, it can handle external links to other domains, it can handle iFrames, simulate keypresses and clicks, and move the mouse to specific co-ordinates within the browser.

  • More extensive community support and documentation

Protractor disadvantages:

  • Slower and more brittle - in general there is a higher likelihood of cryptic and/or intermittent errors which may cause your tests to fail even though there is nothing wrong with your application

  • For highly experienced automation engineers, the fundamental "brittle" nature of Selenium can be worked around - it can be reliable but only if you really know what you are doing

  • Less graceful handling of promises - relies on async/await or .then to manage the order of execution. Therefore it is a bit harder to read the code.

  • Harder to set up, and the method of setup impacts its reliability. For example, a hub/node configuration where the selenium jar is on a different physical machine than the browser under test will cause unreliability in your tests. Not everyone knows about this type of thing, so it's common to find Selenium frameworks that are set up poorly.

It's probably better to use Cypress if

  • you're at a smaller company and have a close relationship with developers who can help write hooks or stubs in their code to assist your testing

  • you don't need to do things like switch between tabs or test links to external top-level domains

It's probably better to use Protractor if

  • You might need to switch between tabs or test external links to other domains within the scope of your framework

  • You want to use a more accurate simulation of how a real user interacts with a browser (i.e. click at this location, type these keys)

  • You're at a company where you won't have any support from developers in writing hooks or stubs to make their code more testable in a less powerful framework like Cypress

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Jian Wang
Web Engineer at sentaca | 1 upvotes 路 134.4K views
Recommends

Please try Handow, the e2e tool basing on Puppeteer.

Gherkin syntax compatible

Chrome/Chromium orentied, driven by Puppeteer engine

Complete JavaScript programming

Create test suites rapidly without coding (or a little bit), basing on built-in steps library

Schedule test with plans and arrange stories with sequential stages

Fast running, execute story groups in parallel by multi-workers

Built-in single page report render

Cover page view, REST API and cookies test

https://github.com/newlifewj/handow

http://demo.shm.handow.org/reports

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Decisions about Chai and Cypress
Shared insights
on
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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Pros of Chai
Pros of Cypress
    Be the first to leave a pro
    • 27
      Open source
    • 21
      Great documentation
    • 19
      Simple usage
    • 18
      Fast
    • 10
      Cross Browser testing
    • 9
      Easy us with CI
    • 5
      Npm install cypress only
    • 1
      Good for beginner automation engineers

    Sign up to add or upvote prosMake informed product decisions

    Cons of Chai
    Cons of Cypress
      Be the first to leave a con
      • 20
        Cypress is weak at cross-browser testing
      • 13
        Switch tabs : Cypress can'nt support
      • 12
        No iFrame support
      • 9
        No multiple domain support
      • 9
        No page object support
      • 8
        No file upload support
      • 8
        No support for multiple tab control
      • 8
        No xPath support
      • 7
        No support for Safari
      • 7
        Cypress doesn't support native app
      • 7
        Re-run failed tests retries not supported yet
      • 7
        No support for multiple browser control
      • 4
        Adobe
      • 4
        Using a non-standard automation protocol
      • 4
        Not freeware
      • 4
        $20/user/thread for reports
      • 3
        No 'WD wire protocol' support

      Sign up to add or upvote consMake informed product decisions

      What is Chai?

      It is a BDD / TDD assertion library for node and the browser that can be delightfully paired with any javascript testing framework. It has several interfaces that allow the developer to choose the most comfortable. The chain-capable BDD styles provide an expressive language & readable style, while the TDD assert style provides a more classical feel.

      What is Cypress?

      Cypress is a front end automated testing application created for the modern web. Cypress is built on a new architecture and runs in the same run-loop as the application being tested. As a result Cypress provides better, faster, and more reliable testing for anything that runs in a browser. Cypress works on any front-end framework or website.

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

      Jobs that mention Chai and Cypress as a desired skillset
      CBRE
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      Poland Mazowieckie Warsaw
      CBRE
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      What companies use Chai?
      What companies use Cypress?
      See which teams inside your own company are using Chai or Cypress.
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      What tools integrate with Chai?
      What tools integrate with Cypress?

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      What are some alternatives to Chai and Cypress?
      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.
      Matcha
      Matcha is a package for building iOS and Android applications and frameworks in Go. Matcha provides a UI component library similar to ReactNative and exposes bindings to Objective-C and Java code through reflection. The library also provides Go APIs for common app tasks.
      Jest
      Jest provides you with multiple layers on top of Jasmine.
      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.
      Protractor
      Protractor is an end-to-end test framework for Angular and AngularJS applications. Protractor runs tests against your application running in a real browser, interacting with it as a user would.
      See all alternatives