Zlib#| nodejs.org
When you're writing tests, you often need to check that values meet certain conditions. expect gives you access to a number of "matchers" that let you validate different things.| jestjs.io
V8#| nodejs.org
The jest object is automatically in scope within every test file. The methods in the jest object help create mocks and let you control Jest's overall behavior. It can also be imported explicitly by via import from '@jest/globals'.| jestjs.io
In your test files, Jest puts each of these methods and objects into the global environment. You don't have to require or import anything to use them. However, if you prefer explicit imports, you can do import {describe, expect, test} from '@jest/globals'.| jestjs.io
Bun is stable and ready for production.| bun.sh
Core API#| nodejs.org
Hello world#| nodejs.org
Class: FileHandle#| nodejs.org
Snapshot tests are a very useful tool whenever you want to make sure your UI does not change unexpectedly.| jestjs.io
Class: Worker#| nodejs.org
Benefits for LWN subscribers| lwn.net