Overview

Jest

Stacks10.0K

Followers4.1K

Votes175

Enzyme

Stacks984

Followers349

Votes0

Enzyme vs Jest: What are the differences?

Introduction

In web development, Enzyme and Jest are popular tools used for testing React applications. While both are essential for ensuring the quality and functionality of the code, they have several key differences that set them apart.

Rendering Approach: Enzyme focuses on shallow rendering, allowing isolated testing of React components without rendering their child components. On the other hand, Jest uses a full DOM rendering approach, which renders the entire component tree, including child components, for testing.
API Complexity: Enzyme provides a more extensive API with multiple helper functions for testing React components, making it more flexible but also potentially more complex for beginners. Jest, on the other hand, has a simpler API, making it easier to learn and use for basic testing needs.
Component Selection: Enzyme provides a variety of methods to select React components for testing, such as find(), filter(), and contains(), giving developers more control over their tests. In contrast, Jest primarily relies on selectors like getBy and queryBy from libraries like @testing-library/react for component selection.
Snapshot Testing: Jest has built-in support for snapshot testing, allowing developers to capture the rendered output of a component and compare it against future changes. Enzyme, however, does not have snapshot testing built into its core functionality, requiring additional setup and configuration for this type of testing.
Async Testing: Jest provides built-in support for asynchronous testing with functions like async/await, making it easier to test components that involve asynchronous operations. Enzyme, while capable of handling asynchronous tests, might require additional libraries or configurations for seamless async testing.
Configuration and Setup: Jest comes pre-configured with most of the necessary tools and libraries for testing React applications, requiring minimal setup and configuration. Enzyme, on the other hand, may need additional configurations and dependencies, such as Enzyme Adapter for React version compatibility, before it can be fully utilized in testing.

In Summary, Enzyme and Jest differ in rendering approach, API complexity, component selection methods, snapshot testing support, async testing capabilities, and configuration requirements for setting up testing environments in React applications.

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Advice on Jest, Enzyme

Dane

Feb 7, 2020

Needs adviceon

Cypress

Jest

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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Comments

Anonymous

Feb 6, 2020

Needs advice

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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Comments

Detailed Comparison

Jest	Enzyme
Jest provides you with multiple layers on top of Jasmine.	Enzyme is a JavaScript Testing utility for React that makes it easier to assert, manipulate, and traverse your React Components' output.
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	Shallow rendering; Full DOM rendering; Static rendered markup; React Hooks support
Statistics
Stacks 10.0K	Stacks 984
Followers 4.1K	Followers 349
Votes 175	Votes 0
Pros & Cons
Pros 36 Open source 32 Mock by default makes testing much simpler 23 Testing React Native Apps 20 Parallel test running 16 Fast Cons 4 Documentation 4 Ambiguous configuration 3 Difficult 2 Ambiguous 2 Multiple error messages for same error	No community feedback yet
Integrations
No integrations available	React

What are some alternatives to Jest, Enzyme?

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.

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.

CodeceptJS

It is a modern end to end testing framework with a special BDD-style syntax. The test is written as a linear scenario of user's action on a site. Each test is described inside a Scenario function with I object passed into it.

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.

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.

Ghost Inspector

It lets you create and manage UI tests that check specific functionality in your website or application. We execute these automated browser tests continuously from the cloud and alert you if anything breaks.

QUnit

QUnit is a powerful, easy-to-use JavaScript unit testing framework. It's used by the jQuery, jQuery UI and jQuery Mobile projects and is capable of testing any generic JavaScript code, including itself!