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Jest has become an essential tool for developers looking to ensure the correctness of their business logic while maintaining the …
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What is Jest?
Jest is a JavaScript testing framework designed to ensure the correctness of any JavaScript codebase. According to the Jest Core Team, it provides an approachable, familiar, and feature-rich API for writing tests and delivers results quickly. Jest is said to be suitable for companies of all sizes, from...
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What is Jest?
Jest is a JavaScript testing framework available free and open source under an MIT license from Facebook Open Source.
Entry-level set up fee?
- No setup fee
For the latest information on pricing, visithttps://github.com/facebook/jest
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- Free Trial
- Free/Freemium Version
- Premium Consulting/Integration Services
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Product Details
- About
- Tech Details
What is Jest?
Jest is a JavaScript testing framework designed to ensure the correctness of any JavaScript codebase. According to the Jest Core Team, it provides an approachable, familiar, and feature-rich API for writing tests and delivers results quickly. Jest is said to be suitable for companies of all sizes, from small startups to large enterprises. It caters to a wide range of professions and industries, including software developers, quality assurance engineers, web development agencies, e-commerce companies, and SaaS companies.
Key Features
Zero config: According to the vendor, Jest aims to work out of the box, config-free, on most JavaScript projects. It is designed to eliminate the need for complex configuration setups, allowing developers to start writing tests quickly.
Snapshots: Jest allows developers to create tests that keep track of large objects with ease. The vendor claims that snapshots can live alongside the tests or be embedded inline, providing a convenient way to check for changes in object structures.
Isolated tests: Jest runs tests in their own processes to maximize performance. This parallelization is said to ensure that tests are executed independently and do not interfere with each other, improving efficiency.
Great API: Jest provides a comprehensive toolkit with a well-documented and well-maintained API. The vendor states that it includes functions like it, expect, and more, making it easy to write expressive and readable test code.
Fast and safe: According to the vendor, Jest ensures that tests have unique global state, allowing them to be reliably run in parallel. It is claimed to prioritize previously failed tests and reorganizes test runs based on the duration of test files, optimizing test execution speed.
Code coverage: Jest offers built-in code coverage generation with the --coverage flag. According to the vendor, it can collect code coverage information from entire projects, including untested files, without requiring additional setup.
Easy mocking: Jest uses a custom resolver for imports in tests, simplifying the mocking of external objects. The vendor claims that mocked imports can be used with the Mock Functions API to spy on function calls and provide readable test syntax.
Great exceptions: When tests fail, Jest provides rich context and detailed error messages to help diagnose issues. According to the vendor, it offers a range of helpful exception messages, such as toBetoBeCloseTotoEqualtoStrictEqualtoHavePropertytoMatchSnapshottoThrowError.
Jest Technical Details
| Operating Systems | Unspecified |
|---|---|
| Mobile Application | No |
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- Business Problems Solved
Jest has become an essential tool for developers looking to ensure the correctness of their business logic while maintaining the efficiency of their development process. Users have found it to be a fantastic solution for testing their code base, allowing them to identify and fix issues before deploying the software to production. By automating the testing process, Jest helps developers catch any changes that may break the code or lead to unexpected outcomes, resulting in reliable and robust software.
One key advantage of using Jest is its well-organized coverage report, which empowers users to set coverage criteria restrictions and receive notifications accordingly. Additionally, users appreciate the convenience of shortcuts like pressing 'a' to run all tests, streamlining their workflow and saving time. Another valuable feature of Jest is its ability to automatically detect and run test files named with 'spec.js', eliminating the need for manual configuration. Users have relied on Jest for unit testing their JavaScript code for almost 1.5 years, finding it beneficial in maintaining the sanity of their products by increasing code coverage through comprehensive test cases and test suites. Whether it's ensuring correctness or improving the reliability of JavaScript applications, Jest offers an effective solution for writing, organizing, and executing unit tests efficiently.