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Jest vs Selenium: What are the differences?
Jest: Painless JavaScript Unit Testing. Jest provides you with multiple layers on top of Jasmine; Selenium: Web Browser Automation. 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.
Jest belongs to "Javascript Testing Framework" category of the tech stack, while Selenium can be primarily classified under "Browser Testing".
"Open source" is the primary reason why developers consider Jest over the competitors, whereas "Automates browsers" was stated as the key factor in picking Selenium.
Jest and Selenium are both open source tools. Jest with 26.1K GitHub stars and 3.53K forks on GitHub appears to be more popular than Selenium with 14.7K GitHub stars and 4.92K GitHub forks.
MIT, PedidosYa, and HubSpot are some of the popular companies that use Selenium, whereas Jest is used by Repro, Glympse, and Ubiqua. Selenium has a broader approval, being mentioned in 770 company stacks & 425 developers stacks; compared to Jest, which is listed in 262 company stacks and 150 developer stacks.
we are having one web application developed in Reacts.js. in the application, we have only 4 to 5 pages that we need to test. I am having experience in selenium with java. Please suggets which tool I should use. and why ............................ ............................ .............................
with the help of selenium we can automate react js for functional testing
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 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
Pros of Selenium
- Automates browsers173
- Testing154
- Essential tool for running test automation101
- Record-Playback24
- Remote Control24
- Data crawling8
- Supports end to end testing7
- Functional testing6
- Easy set up6
- The Most flexible monitoring system4
- End to End Testing3
- Easy to integrate with build tools3
- Comparing the performance selenium is faster than jasm2
- Record and playback2
- Compatible with Python2
- Easy to scale2
- Integration Tests2
- Integrated into Selenium-Jupiter framework0
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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
Cons of Selenium
- Flaky tests8
- Slow as needs to make browser (even with no gui)4
- Update browser drivers1
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