Migrating from Mocha to Jest
Come check out our new digs at 999 Brannan, our second office in San Francisco! We’d been using Mocha at Airbnb since September 2013, but due to increasing growing pains, we’ve recently migrated from Mocha to Jest. The migration actually turned out to require minimal changes to our tests and infrastructure, and provided a myriad of benefits. Minimal Changes to TestsWe’ve put significant effort int
🃏 Jest 19: Immersive Watch Mode & Test Platform Improvements · Jest
Today we are pleased to ship version 19 of the Jest testing platform. It's the biggest Jest release we have shipped so far and we are quite excited to show you what we've built over the last two months: Immersive Watch Mode We completely rewrote the watch mode to make it instant and more extensible. As a result, the experience of using it really is immersive: tests re-run instantly after a file c
Testing with Jest Snapshots: First Impressions
Over the past 6 months my team at work has been slowly transitioning a large Backbone application to React. One of the main goals of the transition has been to build out unit tests as we transition components. As part of that we switched from using Karma to using Jest for managing our tests. Our new setup with Jest has several advantages over our previous setup. All Jest tests run through node usi
Jest 16.0: Turbocharged CLI & Community Update · Jest
It's been one month since the last major release and we've made significant improvements to Jest since. In this major release we are updating the snapshot format we are using which will likely require snapshots to be updated when upgrading Jest. We don't make these changes lightly and don't expect this to happen often but we think it is necessary to improve the format from time to time. Upgraded C
Jest 15.0: New Defaults for Jest · Jest
We spent the past year making Jest faster, easier to configure, added tons of features and built snapshot testing. However, there were two areas where we invested very little: the CLI output and user experience. With Jest 15 we are changing the framework radically to make it easier to use both for beginners and experienced users. We are excited that our investment in Jest is now paying off: we can
Jest 14.0: React Tree Snapshot Testing · Jest
One of Jest's philosophies is to provide an integrated “zero-configuration” experience. We want to make it as frictionless as possible to write good tests that are useful. We observed that when engineers are provided with ready-to-use tools, they end up writing more tests, which in turn results in stable and healthy code bases. One of the big open questions was how to write React tests efficiently
Jest 11.0 · Jest
Today we're announcing a switch to major revisions for Jest with Jest 11.0 being the first major release. Jest has been used by Facebook engineers and on our continuous integration systems for years and we believe Jest has been way beyond a “1.0 release” for a long time. This is similar to a change the React team has made. If you are using Jest 0.9 or Jest 0.10 the upgrade should be seamless. All
JavaScript Unit Testing Performance · Jest
Jest is running thousands of tests at Facebook at all times, either through continuous integration or invoked by engineers manually during development. This worked well for years even as the people working on Jest moved on to other projects within Facebook. As engineers added more and more tests though, we noticed the performance of Jest wasn't going to scale. Additionally, in the last year the Ja
jest入門 - Mockテストと非同期テスト - Qiita
Jestとは Facebookで開発しているUnitTestフレームワーク。 特徴は以下です。 FAMILIAR APPROACH Jasmineベースなので記法は馴染みやすいものです。 MOCK BY DEFAULT CommonJSスタイルのrequire()をMockすることで単体テストを実現します。 SHORT FEEDBACK LOOP サクッとテストできる。 ブラウザとかPhantom.jsとか要らないよって意味だと思う。。。 何がいいのか？ 素のJasmineと比べてこんな特徴があるようです。 テストファイルを勝手に探してくれる。 DefaultでMockされるので、あえて記述しない限り純粋な単体テストになる。 mockを使うことで、非同期処理を同期的に書ける。 Jasmine2.Xでは非同期サポートがされたとか聞きましたがよく知らない。 jsdomを使うことで、HTMLを含
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GitHub - locoslab/vue-jest-utils: Utilities for testing Vue.js components using Jest
Snapshot Testing: Use With Care
Add Jest. by cpojer · Pull Request #250 · facebook/create-react-app
Jest 13.0: Flow & REPL · Jest
How to build a React JS test suite