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jestjs io docs apijestjs io docs testing-frameworksjestjs io blog 2025 06 04 jest-30jestjs io docs setup-teardownOften while writing tests you have some setup work that needs to happen before tests run, and you have some finishing work that needs to happen after tests run Jest provides helper functions to handle this See React: Function and Class Components Reminders that with Class components, we expect Jest to be used to test props and not methods directly Now let's use React's test renderer and Jest's snapshot feature to interact with the component and capture the rendered output and create a snapshot file:jestjs io docs jest-platformjestjs ioIn 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' Jest runs the code of your project as JavaScript, hence a transformer is needed if you use some syntax not supported by Node out of the box (such as JSX, TypeScript, Vue templates) Note: Jest documentation uses yarn commands, but npm will also work You can compare yarn and npm commands in the yarn docs, here Let's get started by writing a test for a hypothetical function that adds two numbers First, create a sum js file: function sum(a, b) { return a + b; } module exports = sum;You can cherry pick specific features of Jest and use them as standalone packages Here's a list of the available packages:jestjs io docs getting-startedToday we are happy to announce the release of Jest 30 This release features a substantial number of changes, fixes, and improvements While it is one of the largest major releases of Jest ever, we admit that three years for a major release is too long Often while writing tests you have some setup work that needs to happen before tests run, and you have some finishing work that needs to happen after tests run Jest provides helper functions to handle this 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 docs tutorial-reactJest is a JavaScript testing framework designed to ensure correctness of any JavaScript codebase It allows you to write tests with an approachable, familiar and feature-rich API that gives you results quickly Jest is a universal testing platform, with the ability to adapt to any JavaScript library or framework In this section, we'd like to link to community posts and articles about integrating Jest into popular JS libraries See React: Function and Class Components Reminders that with Class components, we expect Jest to be used to test props and not methods directly Now let's use React's test renderer and Jest's snapshot feature to interact with the component and capture the rendered output and create a snapshot file:Jest is a universal testing platform, with the ability to adapt to any JavaScript library or framework In this section, we'd like to link to community posts and articles about integrating Jest into popular JS libraries Jun 4, 2025 · Today we are happy to announce the release of Jest 30 This release features a substantial number of changes, fixes, and improvements While it is one of the largest major releases of Jest ever, we admit that three years for a major release is too long Jest is a JavaScript testing framework designed to ensure correctness of any JavaScript codebase It allows you to write tests with an approachable, familiar and feature-rich API that gives you results quickly jestjs io docs configurationJest can be used in projects that use webpack to manage assets, styles, and compilation webpack does offer some unique challenges over other tools Refer to the webpack guide to get started Jest can be used in projects that use webpack to manage assets, styles, and compilation webpack does offer some unique challenges over other tools Refer to the webpack guide to get started Jest runs the code of your project as JavaScript, hence a transformer is needed if you use some syntax not supported by Node out of the box (such as JSX, TypeScript, Vue templates) Note: Jest documentation uses yarn commands, but npm will also work You can compare yarn and npm commands in the yarn docs, here Let's get started by writing a test for a hypothetical function that adds two numbers First, create a sum js file: function sum(a, b) { return a + b; } module exports = sum;archive jestjs io docs en 22 x getting-started htmlJest adds the inlineSnapshot string argument to the matcher in the test file (instead of an external snap file) the first time that the test runs Check out the section on Inline Snapshots for more info

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