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Jest

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react-testing-library

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Decisions about Jest and react-testing-library
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Jest
Cypress

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 Jest
Pros of react-testing-library
  • 34
    Open source
  • 30
    Mock by default makes testing much simpler
  • 21
    Testing React Native Apps
  • 18
    Parallel test running
  • 14
    Fast
  • 13
    Bundled with JSDOM to enable DOM testing
  • 7
    Mock by default screws up your classes, breaking tests
  • 7
    Out of the box code coverage
  • 6
    One stop shop for unit testing
  • 6
    Promise support
  • 3
    Great documentation
  • 1
    Preset support
  • 1
    Built in watch option with interactive filtering menu
  • 1
    Assert Library Included
  • 0
    Can be used for BDD
  • 2
    We can test behavior

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Cons of Jest
Cons of react-testing-library
  • 2
    Many bugs still not fixed months/years after reporting
  • 2
    Multiple error messages for same error
  • 2
    Documentation
  • 2
    Ambiguous configuration
  • 1
    Bugged
  • 1
    Unstable
  • 1
    Bad docs
  • 1
    Ambiguous
  • 1
    Still does't support .mjs files natively
  • 1
    Can't fail beforeAll to abort tests
  • 1
    Difficult to run single test/describe/file
  • 1
    Meh
  • 1
    Difficult
  • 1
    BeforeAll timing out makes all passing tests fail
  • 1
    Reporter is too general
  • 0
    Interaction with watch mode on terminal
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    What is Jest?

    Jest provides you with multiple layers on top of Jasmine.

    What is react-testing-library?

    It is a simple and complete React DOM testing utility that encourage good testing practices. It provides light utility functions on top of react-dom and react-dom/test-utils, in a way that encourages better testing practices.

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    What are some alternatives to Jest and react-testing-library?
    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.
    Selenium
    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.
    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.
    Enzyme
    Enzyme is a JavaScript Testing utility for React that makes it easier to assert, manipulate, and traverse your React Components' output.
    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.
    See all alternatives