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<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Debugging Tests · Create React App</title><meta name="viewport" content="width=device-width"/><meta name="generator" content="Docusaurus"/><meta name="description" content="There are various ways to setup a debugger for your Jest tests. We cover debugging in Chrome and [Visual Studio Code](https://code.visualstudio.com/)."/><meta name="docsearch:language" content="en"/><meta property="og:title" content="Debugging Tests · Create React App"/><meta property="og:type" content="website"/><meta property="og:url" content="https://facebook.github.io/create-react-app/index.html"/><meta property="og:description" content="There are various ways to setup a debugger for your Jest tests. We cover debugging in Chrome and [Visual Studio Code](https://code.visualstudio.com/)."/><meta property="og:image" content="https://facebook.github.io/create-react-app/img/logo-og.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://facebook.github.io/create-react-app/img/logo-og.png"/><link rel="shortcut icon" href="/create-react-app/img/favicon/favicon.ico"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css"/><script type="text/javascript" src="https://buttons.github.io/buttons.js"></script><link rel="stylesheet" href="/create-react-app/css/main.css"/></head><body class="sideNavVisible separateOnPageNav"><div class="fixedHeaderContainer"><div class="headerWrapper wrapper"><header><a href="/create-react-app/"><img class="logo" src="/create-react-app/img/logo.svg" alt="Create React App"/><h2 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</script></nav></div><div class="container mainContainer docMainContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/facebook/create-react-app/edit/master/docusaurus/docs/debugging-tests.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 class="postHeaderTitle">Debugging Tests</h1></header><article><div><span><p>There are various ways to setup a debugger for your Jest tests. We cover debugging in Chrome and <a href="https://code.visualstudio.com/">Visual Studio Code</a>.</p>
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<blockquote>
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<p>Note: debugging tests requires Node 8 or higher.</p>
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</blockquote>
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<h2><a class="anchor" aria-hidden="true" id="debugging-tests-in-chrome"></a><a href="#debugging-tests-in-chrome" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Debugging Tests in Chrome</h2>
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<p>Add the following to the <code>scripts</code> section in your project's <code>package.json</code></p>
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<pre><code class="hljs css language-json">"scripts": {
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"test:debug": "react-scripts --inspect-brk test --runInBand"
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}
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</code></pre>
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<p>Place <code>debugger;</code> statements in any test and run:</p>
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<pre><code class="hljs css language-bash">$ npm run <span class="hljs-built_in">test</span>:debug
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</code></pre>
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<p>This will start running your Jest tests, but pause before executing to allow a debugger to attach to the process.</p>
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<p>Open the following in Chrome</p>
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<pre><code class="hljs"><span class="hljs-keyword">about</span>:<span class="hljs-keyword">inspect</span>
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</code></pre>
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<p>After opening that link, the Chrome Developer Tools will be displayed. Select <code>inspect</code> on your process and a breakpoint will be set at the first line of the react script (this is done simply to give you time to open the developer tools and to prevent Jest from executing before you have time to do so). Click the button that looks like a "play" button in the upper right hand side of the screen to continue execution. When Jest executes the test that contains the debugger statement, execution will pause and you can examine the current scope and call stack.</p>
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<blockquote>
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<p>Note: the --runInBand cli option makes sure Jest runs test in the same process rather than spawning processes for individual tests. Normally Jest parallelizes test runs across processes but it is hard to debug many processes at the same time.</p>
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</blockquote>
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<h2><a class="anchor" aria-hidden="true" id="debugging-tests-in-visual-studio-code"></a><a href="#debugging-tests-in-visual-studio-code" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Debugging Tests in Visual Studio Code</h2>
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<p>Debugging Jest tests is supported out of the box for <a href="https://code.visualstudio.com">Visual Studio Code</a>.</p>
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<p>Use the following <a href="https://code.visualstudio.com/docs/editor/debugging#_launch-configurations"><code>launch.json</code></a> configuration file:</p>
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<pre><code class="hljs">{
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<span class="hljs-attr">"version"</span>: <span class="hljs-string">"0.2.0"</span>,
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<span class="hljs-attr">"configurations"</span>: [
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{
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<span class="hljs-attr">"name"</span>: <span class="hljs-string">"Debug CRA Tests"</span>,
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<span class="hljs-attr">"type"</span>: <span class="hljs-string">"node"</span>,
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<span class="hljs-attr">"request"</span>: <span class="hljs-string">"launch"</span>,
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<span class="hljs-attr">"runtimeExecutable"</span>: <span class="hljs-string">"${workspaceRoot}/node_modules/.bin/react-scripts"</span>,
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<span class="hljs-attr">"args"</span>: [
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<span class="hljs-string">"test"</span>,
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<span class="hljs-string">"--runInBand"</span>,
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<span class="hljs-string">"--no-cache"</span>
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],
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<span class="hljs-attr">"cwd"</span>: <span class="hljs-string">"${workspaceRoot}"</span>,
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<span class="hljs-attr">"protocol"</span>: <span class="hljs-string">"inspector"</span>,
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<span class="hljs-attr">"console"</span>: <span class="hljs-string">"integratedTerminal"</span>,
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<span class="hljs-attr">"internalConsoleOptions"</span>: <span class="hljs-string">"neverOpen"</span>
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}
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]
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}
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</code></pre>
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||
</span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/create-react-app/docs/running-tests"><span class="arrow-prev">← </span><span>Previous</span></a><a class="docs-next button" href="/create-react-app/docs/proxying-api-requests-in-development"><span>Next</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav docOnPageNav"><ul class="toc-headings"><li><a href="#debugging-tests-in-chrome">Debugging Tests in Chrome</a></li><li><a href="#debugging-tests-in-visual-studio-code">Debugging Tests in Visual Studio Code</a></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/create-react-app/" class="nav-home"><img src="/create-react-app/img/logo.svg" alt="Create React App" width="66" height="58"/></a><div><h5>Docs</h5><a href="/create-react-app/docs/getting-started">Get Started</a><a href="https://reactjs.org/" target="_blank" rel="noreferrer noopener">Learn React</a></div><div><h5>Community</h5><a href="https://stackoverflow.com/questions/tagged/create-react-app" target="_blank" rel="noreferrer noopener">Stack Overflow</a><a href="https://spectrum.chat/react" target="_blank" rel="noreferrer noopener">Spectrum</a><a href="https://twitter.com/reactjs" target="_blank" rel="noreferrer noopener">Twitter</a></div><div><h5>More</h5><a href="https://www.github.com/facebook/create-react-app">GitHub</a><a class="github-button" href="https://github.com/facebook/create-react-app" data-icon="octicon-star" data-count-href="/facebook/create-react-app/stargazers" data-show-count="true" data-count-aria-label="# stargazers on GitHub" aria-label="Star this project on GitHub">Star</a></div></section><a href="https://code.facebook.com/projects/" target="_blank" rel="noreferrer noopener" class="fbOpenSource"><img src="/create-react-app/img/oss_logo.png" alt="Facebook Open Source" width="170" height="45"/></a><section class="copyright">Copyright © 2018 Facebook Inc.</section></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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