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Enzyme vs Jest: What are the differences?


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.

  1. 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.

  2. 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.

  3. 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.

  4. 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.

  5. 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.

  6. 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.

Decisions about Enzyme and Jest
Shared insights

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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Pros of Enzyme
Pros of Jest
    Be the first to leave a pro
    • 36
      Open source
    • 32
      Mock by default makes testing much simpler
    • 23
      Testing React Native Apps
    • 20
      Parallel test running
    • 16
    • 13
      Bundled with JSDOM to enable DOM testing
    • 8
      Mock by default screws up your classes, breaking tests
    • 7
      Out of the box code coverage
    • 7
      Promise support
    • 6
      One stop shop for unit testing
    • 3
      Great documentation
    • 2
      Assert Library Included
    • 1
      Built in watch option with interactive filtering menu
    • 1
      Preset support
    • 0
      Can be used for BDD
    • 0

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    Cons of Enzyme
    Cons of Jest
      Be the first to leave a con
      • 4
      • 4
        Ambiguous configuration
      • 3
      • 2
        Many bugs still not fixed months/years after reporting
      • 2
        Multiple error messages for same error
      • 2
        Difficult to run single test/describe/file
      • 2
      • 2
      • 1
        BeforeAll timing out makes all passing tests fail
      • 1
      • 1
        Reporter is too general
      • 1
      • 1
        Bad docs
      • 1
        Still does't support .mjs files natively
      • 1
        Can't fail beforeAll to abort tests
      • 0
        Interaction with watch mode on terminal

      Sign up to add or upvote consMake informed product decisions

      What is Enzyme?

      Enzyme is a JavaScript Testing utility for React that makes it easier to assert, manipulate, and traverse your React Components' output.

      What is Jest?

      Jest provides you with multiple layers on top of Jasmine.

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      What companies use Enzyme?
      What companies use Jest?
      See which teams inside your own company are using Enzyme or Jest.
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      What tools integrate with Enzyme?
      What tools integrate with Jest?

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