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Meta Open Source is transferring Jest to the OpenJS Foundation
Meta Open Source is transferring Jest to the OpenJS Foundation Meta Open Source is officially transferring Jest, its open source JavaScript testing framework, to the OpenJS Foundation. With over 17 million weekly downloads and over 38,000 GitHub stars, Jest is the most used testing framework in the JavaScript ecosystem and is used by companies of all sizes, including Amazon, Google, Microsoft, and
Jest 28: Shedding weight and improving compatibility 🫶 · Jest
Jest 28 is finally here, and it comes with some long requested features such as support for sharding a test run across multiple machines, package exports and the ability to customize the behavior of fake timers. These are just some personal highlights, and we'll be highlighting more in this blog post. Additionally, as announced in the Jest 27 blog post last year, we have removed some packages that
Mocking With Undici Like a Pro
Undici is a fast, reliable, and spec-compliant HTTP/1.1 client that is written from scratch and represents the evolution of the Node.js HTTP stack. It is quickly becoming one of the most popular packages out there, with almost half a million weekly downloads on npm. And if you don’t believe us, check out this tweet from Node.js TSC member Matteo Collina. Because Undici re-invents HTTP primitives a
Strykerを使ってTypeScriptでMutation Testingする
概要 JavaScript/TypeScript向けのMutation Testing FrameworkであるStryker-jsがいい感じになってきたので紹介してみます。簡単な紹介のみです。 対象読者 Strykerの概要を知りたい人 Mutation Testingよく知らないJSer/TSer Mutation Testing導入したいけどJS/TS用のツールが見つからなかった人 Mutation Testingとは テスト対象のコードを変更(Mutate)するミュータントを仕込み、Unit Testが正しくそれらのミュータントを退治できるか測定するものです。 一般的には退治できた割合が高いほど意味のあるUnit Testを書いていると言えます。 Wikipediaの項目にもある通りFuzzingの一種とも言えます。 Mutation Testing自体はGoogleが論文出してた
Release v9.0.0 · mochajs/mocha
9.0.0 / 2021-06-07 💥 Breaking Changes #4633: Drop Node.js v10.x support (@juergba) #4635: import-first loading of test files (@giltayar) Mocha is going ESM-first! This means that it will now use ESM import(test_file) to load the test files, instead of the CommonJS require(test_file). This is not a problem, as import can also load most files that require does. In the rare cases where this fails, i
Jest 27: New Defaults for Jest, 2021 edition ⏩ · Jest
In the Jest 26 blog post about a year ago, we announced that after two major releases with few breaking changes, Jest 27 will flip some switches to set better defaults for projects that are new or can migrate smoothly. This gives us the opportunity to remove some packages from the default distribution of Jest 28 and publish them as separately installable and pluggable modules instead. Everyone on
Testing JavaScript Applications - Lucas da Costa
Automated testing will help you write high-quality software in less time, with more confidence, fewer bugs, and without constant manual oversight. Testing JavaScript Applications is a guide to building a comprehensive and reliable JS application testing suite, covering both how to write tests and how JS testing tools work under the hood. You’ll learn from Lucas de Costa, a core contributor to popu
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Playwright 1.22: Component Tests (preview) Overview
Release v10.0.0 · mochajs/mocha
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