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Cypress vs Jest: What are the differences?
Cypress and Jest are both popular testing frameworks used in web development. While they have some similarities, there are key differences that set them apart.
Syntax and Test Structure: Cypress uses a simple and intuitive syntax that allows developers to write tests in a declarative manner. It provides a clean and easy-to-understand test structure. On the other hand, Jest follows a more traditional syntax and employs a modular test structure.
Test Runner: Cypress includes its own built-in test runner, which allows developers to execute tests directly in the browser. This enables real-time feedback and debugging capabilities. Jest, on the other hand, uses a separate test runner for executing tests, and it works by simulating a browser environment using a headless browser or a virtual DOM.
Focus: Cypress is primarily designed for end-to-end testing and excels in providing an easy way to interact with an application just like a user would. It allows developers to perform actions like clicks and form submissions and even execute JavaScript directly in the browser. Meanwhile, Jest is more focused on unit testing and provides powerful mocking and assertion capabilities.
Performance: Cypress is known for its fast and efficient testing capabilities. It runs tests in a single thread, which allows it to execute commands quickly and deliver faster test results. Jest, on the other hand, can execute tests in parallel, making it suitable for projects with a large number of unit tests.
Community Support: Both Cypress and Jest have active communities that contribute to their development and provide support. However, Jest has a larger user base and a wider range of resources available, including extensive documentation and online tutorials.
Integration: Cypress integrates seamlessly with popular front-end frameworks such as React, Angular, and Vue.js. It provides specific libraries and APIs for these frameworks, making it easy to write tests for applications built on them. Jest also has good integration with these frameworks but has a more general approach, making it suitable for testing any JavaScript code.
In summary, Cypress uses a simple and declarative syntax, a built-in test runner, and a focus on end-to-end testing, while Jest uses a traditional and modular syntax, a separate test runner, and a focus on unit testing. Cypress is faster and more user-friendly, but Jest is more versatile and widely used.
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...
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
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
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.
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.
Pros of Cypress
- Open source29
- Great documentation22
- Simple usage20
- Fast18
- Cross Browser testing10
- Easy us with CI9
- Npm install cypress only5
- Good for beginner automation engineers2
Pros of Jest
- Open source36
- Mock by default makes testing much simpler32
- Testing React Native Apps23
- Parallel test running20
- Fast16
- Bundled with JSDOM to enable DOM testing13
- Mock by default screws up your classes, breaking tests8
- Out of the box code coverage7
- Promise support7
- One stop shop for unit testing6
- Great documentation3
- Assert Library Included2
- Built in watch option with interactive filtering menu1
- Preset support1
- Can be used for BDD0
- Karma0
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Cons of Cypress
- Cypress is weak at cross-browser testing21
- Switch tabs : Cypress can'nt support14
- No iFrame support12
- No page object support9
- No multiple domain support9
- No file upload support8
- No support for multiple tab control8
- No xPath support8
- No support for Safari7
- Cypress doesn't support native app7
- Re-run failed tests retries not supported yet7
- No support for multiple browser control7
- $20/user/thread for reports5
- Adobe4
- Using a non-standard automation protocol4
- Not freeware4
- No 'WD wire protocol' support3
Cons of Jest
- Documentation4
- Ambiguous configuration4
- Difficult3
- Many bugs still not fixed months/years after reporting2
- Multiple error messages for same error2
- Difficult to run single test/describe/file2
- Ambiguous2
- Bugged2
- BeforeAll timing out makes all passing tests fail1
- Slow1
- Reporter is too general1
- Unstable1
- Bad docs1
- Still does't support .mjs files natively1
- Can't fail beforeAll to abort tests1
- Interaction with watch mode on terminal0