{"id":3616,"date":"2026-09-15T00:00:40","date_gmt":"2026-09-14T17:00:40","guid":{"rendered":"https:\/\/sumberlaba.com\/index.php\/2026\/09\/15\/how-to-do-unit-testing-in-node-js-a-step-by-step-tutorial\/"},"modified":"2026-09-15T00:00:41","modified_gmt":"2026-09-14T17:00:41","slug":"how-to-do-unit-testing-in-node-js-a-step-by-step-tutorial","status":"publish","type":"post","link":"https:\/\/sumberlaba.com\/index.php\/2026\/09\/15\/how-to-do-unit-testing-in-node-js-a-step-by-step-tutorial\/","title":{"rendered":"How to Do Unit Testing in Node.js: A Step-by-Step Tutorial"},"content":{"rendered":"<h1>How to Do Unit Testing in Node.js: A Step-by-Step Tutorial<\/h1>\n<p>Unit testing is essential for reliable Node.js applications. It helps catch bugs early and ensures your code behaves as expected. This tutorial walks you through setting up and writing unit tests in Node.js.<\/p>\n<h2>1. Choose a Testing Framework<\/h2>\n<p>Popular choices include Jest, Mocha, and AVA. Jest is easy to set up and includes assertions, mocking, and coverage. Install it with <code>npm install --save-dev jest<\/code>. Add a test script to your <code>package.json<\/code>: <code>\"test\": \"jest\"<\/code>.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/sumberlaba.com\/wp-content\/uploads\/2026\/09\/article-1789405236331.jpg\" alt=\"Article illustration\" style=\"display:block;margin:20px auto;max-width:100%;height:auto;border-radius:8px;\" \/><\/p>\n<h2>2. Write Your First Unit Test<\/h2>\n<p>Create a file like <code>sum.js<\/code> with a simple function. Then create <code>sum.test.js<\/code>:<\/p>\n<ul>\n<li>Import the function: <code>const sum = require('.\/sum');<\/code><\/li>\n<li>Write a test using <code>test('adds 1 + 2 to equal 3', () => { expect(sum(1,2)).toBe(3); });<\/code><\/li>\n<\/ul>\n<h2>3. Use Assertions and Mocks<\/h2>\n<p>Assertions verify outcomes. Jest provides <code>expect<\/code> with matchers like <code>toBe<\/code>, <code>toEqual<\/code>. For isolating units, use mocks: <code>jest.fn()<\/code> for functions, <code>jest.mock()<\/code> for modules.<\/p>\n<h2>4. Run Tests and Check Coverage<\/h2>\n<p>Run <code>npm test<\/code>. Jest reports pass\/fail. For coverage, add <code>--coverage<\/code> to the script. Aim for high coverage but focus on critical paths.<\/p>\n<p>Unit testing with Node.js is straightforward. Start with Jest, write focused tests, and integrate them into your workflow. Your code will be more robust and maintainable.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>How to Do Unit Testing in Node.js: A Step-by-Step Tutorial Unit testing is essential for reliable Node.js applications. It helps catch bugs early and ensures your code behaves as expected. This tutorial walks you through setting up and writing unit tests in Node.js. 1. Choose a Testing Framework Popular choices include Jest, Mocha, and AVA. &hellip; <\/p>\n","protected":false},"author":2716,"featured_media":3615,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3616","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-non-category"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/sumberlaba.com\/index.php\/wp-json\/wp\/v2\/posts\/3616","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sumberlaba.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sumberlaba.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sumberlaba.com\/index.php\/wp-json\/wp\/v2\/users\/2716"}],"replies":[{"embeddable":true,"href":"https:\/\/sumberlaba.com\/index.php\/wp-json\/wp\/v2\/comments?post=3616"}],"version-history":[{"count":1,"href":"https:\/\/sumberlaba.com\/index.php\/wp-json\/wp\/v2\/posts\/3616\/revisions"}],"predecessor-version":[{"id":3617,"href":"https:\/\/sumberlaba.com\/index.php\/wp-json\/wp\/v2\/posts\/3616\/revisions\/3617"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sumberlaba.com\/index.php\/wp-json\/wp\/v2\/media\/3615"}],"wp:attachment":[{"href":"https:\/\/sumberlaba.com\/index.php\/wp-json\/wp\/v2\/media?parent=3616"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sumberlaba.com\/index.php\/wp-json\/wp\/v2\/categories?post=3616"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sumberlaba.com\/index.php\/wp-json\/wp\/v2\/tags?post=3616"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}