Chai
Chai

269
95
+ 1
0
Jest
Jest

2.5K
1.8K
+ 1
151
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Chai vs Jest: 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; Jest: Painless JavaScript Unit Testing. Jest provides you with multiple layers on top of Jasmine.

Chai and Jest can be categorized as "Javascript Testing Framework" tools.

Chai and Jest are both open source tools. Jest with 26.4K GitHub stars and 3.57K forks on GitHub appears to be more popular than Chai with 6.39K GitHub stars and 575 GitHub forks.

According to the StackShare community, Jest has a broader approval, being mentioned in 273 company stacks & 161 developers stacks; compared to Chai, which is listed in 6 company stacks and 8 developer stacks.

Decisions about Chai and Jest
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JestJestCypressCypress

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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    Cons of Chai
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      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 Jest?

      Jest provides you with multiple layers on top of Jasmine.
      What companies use Chai?
      What companies use Jest?

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      What tools integrate with Chai?
      What tools integrate with Jest?

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      What are some alternatives to Chai and Jest?
      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.
      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.
      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.
      Enzyme
      Enzyme is a JavaScript Testing utility for React that makes it easier to assert, manipulate, and traverse your React Components' output.
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