🃏 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
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
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Jest 13.0: Flow & REPL · Jest