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Spadek cen. jestjs io docs getting-startedjestjs io docs apiJest 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 The jest command line runner has a number of useful options You can run jest --help to view all available options Many of the options shown below can also be used together to run tests exactly the way you want Every one of Jest's Configuration options can also be specified through the CLI Jest 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 jestjs io docs tutorial-reactjestjs io docs configuration 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' Browse the docs Find what you're looking for in our detailed documentation and guides Learn how to get started with Jest Troubleshoot problems with Jest Learn how to configure Jest Look at the full API Reference You can run Jest directly from the CLI (if it's globally available in your PATH, e g by yarn global add jest or npm install jest --global) with a variety of useful options It's common in JavaScript for code to run asynchronously When you have code that runs asynchronously, Jest needs to know when the code it is testing has completed, before it can move on to another test Jest has several ways to handle this You can run Jest directly from the CLI (if it's globally available in your PATH, e g by yarn global add jest or npm install jest --global) with a variety of useful options It's common in JavaScript for code to run asynchronously When you have code that runs asynchronously, Jest needs to know when the code it is testing has completed, before it can move on to another test Jest has several ways to handle this jestjs iojestjs io docs expect 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 The jest command line runner has a number of useful options You can run jest --help to view all available options Many of the options shown below can also be used together to run tests exactly the way you want Every one of Jest 's Configuration options can also be specified through the CLI jestjs io helpJest 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 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) jestjs io docs testing-frameworks 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 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' 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: 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 clijestjs io docs asynchronous 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; 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