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pytest VS Jest

Compare pytest VS Jest and see what are their differences

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pytest logo pytest

Javascript Testing Framework

Jest logo Jest

Jest is a delightful JavaScript Testing Framework with a focus on simplicity.
  • pytest Landing page
    Landing page //
    2023-10-15
  • Jest Landing page
    Landing page //
    2023-09-10

pytest features and specs

  • Easy to Use
    Pytest is designed to be simple and easy to use, with minimal boilerplate code required to write tests. Its straightforward syntax allows users to quickly write and understand tests.
  • Extensive Plugin System
    Pytest has a flexible and powerful plugin architecture, with a wide range of community-maintained plugins available, allowing for easy customization and extension of its functionality.
  • Detailed Information on Failures
    Pytest provides detailed and informative feedback on failures, enhancing the debugging process by highlighting where and why a test failed.
  • Fixture Support
    Pytest's fixture system allows for easy setup and teardown of test environments, encouraging the reuse of setup code and reducing code duplication.
  • Compatibility
    Pytest is compatible with standard Python testing frameworks such as unittest, allowing for easy migration and integration of existing tests.

Possible disadvantages of pytest

  • Steeper Learning Curve for Advanced Features
    While basic usage is straightforward, mastering advanced pytest features, such as writing custom plugins and fixtures, can have a steeper learning curve.
  • Performance Overhead
    For very large projects, the additional features and flexibility of pytest can introduce some performance overhead when running tests, compared to simpler testing frameworks.
  • Complexity in Parameterized Testing
    While pytest supports parameterized testing, setting up and managing complex parameterizations can become cumbersome and might require additional abstraction layers.
  • Plugin Conflicts
    With a vast ecosystem of plugins, there is a potential for conflicts or compatibility issues between different plugins, especially when they modify similar pytest behaviors.

Jest features and specs

  • Easy Setup
    Jest provides an out-of-the-box configuration which makes it easy to set up and start testing quickly without needing extensive configuration.
  • Snapshot Testing
    Jest supports snapshot testing, allowing developers to capture the state of UI components, making regression testing easier.
  • Mocking Capabilities
    Jest offers powerful mocking capabilities for functions, modules, and timers, enabling isolated and independent unit tests.
  • Parallel Test Execution
    Jest runs tests in parallel, utilizing multiple workers to speed up test execution and improve performance.
  • Comprehensive Documentation
    Jest has thorough and well-maintained documentation which helps developers easily understand and utilize its features.
  • Watch Mode
    Jest has a watch mode feature that automatically re-runs tests when files are updated, improving development workflow.
  • Built-in Code Coverage
    Jest provides built-in code coverage reports, giving developers insights into which parts of their code are covered by tests.

Possible disadvantages of Jest

  • Performance Overhead
    Jest's parallel test execution can sometimes introduce performance overhead, especially in large projects with many workers firing at once.
  • Test Initialization
    Tests can take longer to initialize due to the need for Jest to transform code from modern JavaScript syntax down to older syntax versions.
  • Limited Browser Testing
    Jest is primarily designed for testing Node.js applications and may require additional configuration or tools for full-featured browser testing.
  • Learning Curve
    For developers unfamiliar with JavaScript testing frameworks, understanding Jest's extensive feature set and configuration options can be challenging.
  • Specific to JavaScript
    Jest is specifically designed for JavaScript and may not be suitable for projects that involve multiple programming languages.

Analysis of Jest

Overall verdict

  • Jest is considered a good choice for modern JavaScript development, particularly for projects involving React, due to its robustness, ease of use, and active community support. Its ability to run tests in parallel and produce detailed diagnostics contributes significantly to improving testing efficiency.

Why this product is good

  • Jest is a popular testing framework for JavaScript that provides a simple and highly effective environment for unit testing, especially for applications built with React. It comes with an extensive set of features including a zero configuration setup, a powerful mocking library, and coverage reports, all without needing additional tools. Jest's ease of use and speed make it a preferred choice for developers looking for seamless integration in their development process.

Recommended for

  • Developers working with React and looking for easy integration with minimal configuration.
  • Teams that require a fast and reliable testing tool with excellent community support and active development.
  • Projects that demand comprehensive testing capabilities including unit tests, integration tests, and snapshot testing.

pytest videos

getting started with pytest (beginner - intermediate) anthony explains #518

More videos:

  • Review - Python Code Review: Adding Pytest Tests to an Existing Python Web Scraper
  • Review - pytest: everything you need to know about fixtures (intermediate) anthony explains #487

Jest videos

60 Second Book Review: โ€œInfinite Jestโ€ by David Foster Wallace

More videos:

  • Review - How I Get Through Tough Books - Infinite Jest and Proust
  • Review - David Foster Wallace interview on "Infinite Jest" with Leonard Lopate (03/1996)

Category Popularity

0-100% (relative to pytest and Jest)
Automated Testing
100 100%
0% 0
Developer Tools
0 0%
100% 100
Testing
58 58%
42% 42
JavaScript Framework
0 0%
100% 100

User comments

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Reviews

These are some of the external sources and on-site user reviews we've used to compare pytest and Jest

pytest Reviews

25 Python Frameworks to Master
Pytest is a widely adopted testing framework that is designed to be easy to use and extend. It helps you to write elegant tests in both small and complex Python codebases.
Source: kinsta.com

Jest Reviews

We have no reviews of Jest yet.
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Social recommendations and mentions

Based on our record, Jest seems to be a lot more popular than pytest. While we know about 80 links to Jest, we've tracked only 5 mentions of pytest. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

pytest mentions (5)

  • An Introduction to Testing with Django for Python
    Pytest is an excellent alternative to unittest. Even though it doesn't come built-in to Python itself, it is considered more pythonic than unittest. It doesn't require a TestClass, has less boilerplate code, and has a plain assert statement. Pytest has a rich plugin ecosystem, including a specific Django plugin, pytest-django. - Source: dev.to / over 1 year ago
  • How I Added Continuous Integration (CI) to a C++ Project
    For this lab exercise I had the opportunity to add unit tests to a classmate's project and experience their CI workflow. For this exercise I worked on go-go-web by kliu57. Go-Go Web is written in Python and uses the pytest testing framework. This was my first time writing tests for pytest, but I found the pytest docs helpful. However, more helpful was the information provided in the associated issue and the tests... - Source: dev.to / almost 2 years ago
  • CI/CD Part 1: Unit/Integration Testing
    This week, in a setup for a CI/CD pipeline, I added unit and integration testing using Pytest to my Python CLI and utilized pytest-cov for generating a coverage report. As always, the merged commit for changes to the repo can be found here. - Source: dev.to / almost 2 years ago
  • Testing in Python
    After looking through the various unit testing tools available for Python like pytest, unittest (built-in), and nose, I went with pytest for its simlpicity and ease of use. - Source: dev.to / almost 2 years ago
  • Testing and Refactoring With pytest and pytest-cov
    Up until now we've been using python's unittest module. This was chosen as a first step since it comes with python out of the box. Now that we've gone over dev dependencies I think it's a good time to look at pytest as a unit test alternative. I highly recommend getting accustomed to pytest as it's used quite often in the python ecosystem to handle testing for projects. It's also a bit more user friendly in how it... - Source: dev.to / almost 2 years ago

Jest mentions (80)

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What are some alternatives?

When comparing pytest and Jest, you can also consider the following products

RSpec - RSpec is a testing tool for the Ruby programming language born under the banner of Behavior-Driven Development featuring a rich command line program, textual descriptions of examples, and more.

react-testing-library - [`React Testing Library`][gh] builds on top of `DOM Testing Library` by adding

unittest - Testing Frameworks

Vitest - A blazing fast unit test framework powered by Vite

JUnit - JUnit is a simple framework to write repeatable tests.

Mochajs - Mocha is a JavaScript test framework running on Node.js and the browser, making asynchronous testing simple.