{"id":32376,"date":"2021-11-08T11:00:32","date_gmt":"2021-11-08T19:00:32","guid":{"rendered":"https:\/\/app14743.cloudwayssites.com\/?p=32376"},"modified":"2025-01-17T10:36:49","modified_gmt":"2025-01-17T15:36:49","slug":"how-to-test-mobile-web-app-cypress","status":"publish","type":"post","link":"https:\/\/app14743.cloudwayssites.com\/blog\/how-to-test-mobile-web-app-cypress\/","title":{"rendered":"How to Test a Mobile Web App in Cypress"},"content":{"rendered":"\n<p>Before we start, we need to clear up some areas that tend to confuse people when it comes to <a href=\"https:\/\/app14743.cloudwayssites.com\/blog\/what-is-mobile-testing\/\">mobile testing<\/a>. If you\u2019d like to test a mobile application built for iOS or Android, <a href=\"https:\/\/app14743.cloudwayssites.com\/learn\/frameworks\/cypress\/\">Cypress<\/a> will not be efficient and you should probably reach for a tool like <a href=\"https:\/\/app14743.cloudwayssites.com\/blog\/what-is-appium-introduction-to-appium\/\">Appium<\/a> (although there are some<a href=\"https:\/\/glebbahmutov.com\/blog\/rn-test-for-navigation\/\"> interesting examples by Gleb Bahmutov for React Native<\/a>). Cypress is best known as a tool for testing anything that runs <strong>in a browser<\/strong>. So in order to use Cypress for your mobile testing, your app needs to be able to run in a browser. That brings forward a question: &#8220;What\u2019s the difference between desktop and mobile web app?&#8221;<\/p>\n\n\n\n<p>To answer this question, it\u2019s best to look at the application in test from a perspective of a developer. As someone who creates a web application, you might want to consider a couple of traits that make the mobile app different from a desktop one:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>screen size<\/li>\n\n\n\n<li>touch interface<\/li>\n\n\n\n<li>any other information about the device<\/li>\n<\/ul>\n\n\n\n<p>Let\u2019s go through them one by one and see how we can write a Cypress test that would ensure our application works as expected. If you want to follow along, you can <a href=\"https:\/\/github.com\/filiphric\/mobile-testing\/tree\/main\">clone my repository with the application and attached Cypress tests<\/a>. The simple example application shows different messages based on viewport width, presence of touch interface or user agent.<\/p>\n\n\n\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-testing-the-viewport-size\"><a><\/a><strong>Testing the Viewport Size<\/strong><\/h2>\n\n\n\n<p>We might want to test a responsive CSS on different screen widths to see if the application renders correctly. This can be easily done by using the <code>cy.viewport()<\/code> command. You can specify width and height of the viewport, or choose from one of the predefined devices:<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-rich is-provider-embed-handler wp-block-embed-embed-handler\"><div class=\"wp-block-embed__wrapper\">\n<div class=\"oembed-gist\"><script src=\"https:\/\/gist.github.com\/filiphric\/62405f00809871655df82f5a3ae23feb.js?file=spec.ts\"><\/script><noscript>View the code on <a href=\"https:\/\/gist.github.com\/filiphric\/62405f00809871655df82f5a3ae23feb\">Gist<\/a>.<\/noscript><\/div>\n<\/div><\/figure>\n\n\n\n<p>Using these commands will trigger visibility of a &#8220;it\u2019s getting pretty narrow here&#8221; message:<\/p>\n\n\n\n<p>&lt;<img decoding=\"async\" src=\"https:\/\/app14743.cloudwayssites.com\/wp-content\/uploads\/2021\/11\/getting-narrow.jpg\" alt=\"the text displays \u2018it\u2019s getting pretty narrow here\u2019 on a narrow viewport.\"><\/p>\n\n\n\n<p>CSS responsiveness can hide or show different content, like buttons or modals. A nice trick to test this is to run your existing tests with different resolution. To do that, pass a <code>--config<\/code> flag to your CLI command:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">npx cypress run --config viewportWidth=320 viewportHeight=480<\/code><\/pre>\n\n\n\n<p>You can also set the viewport width and viewport height in <code>cypress.json<\/code> or programmatically via Cypress plugin API. I write about this on my personal blog in a slightly different context, but it still might be helpful in this case.<\/p>\n\n\n\n<p>Depending on your application, you might want to consider testing responsiveness of your application by visual tests using a tool like <a href=\"https:\/\/app14743.cloudwayssites.com\/\">Applitools<\/a>. <a href=\"https:\/\/app14743.cloudwayssites.com\/blog\/functional-testing-guide\/\">Functional tests<\/a> might have a tendency to become too verbose if their sole purpose is to check for elements appearing\/disappearing on different viewports.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-testing-for-touch-devices\"><a><\/a><strong>Testing for Touch Devices<\/strong><\/h2>\n\n\n\n<p>Your application might react differently or render slightly different content based on whether it is opened on a touch screen device or not. Manually you can test this with Chrome DevTools:<\/p>\n\n\n\n<p><img decoding=\"async\" src=\"https:\/\/app14743.cloudwayssites.com\/wp-content\/uploads\/2021\/11\/touch-device-or-not.gif\" alt=\"displays whether we\u2019re viewing the page on a computer that is a touch device, or one that is not.\"><\/p>\n\n\n\n<p>Notice how we can have a touch device, that is actually not a mobile. This is a nice case to consider when testing your app.<\/p>\n\n\n\n<p>In Chrome DevTools, we are simply switching a mode of our browser. It\u2019s like changing a setting to enable viewing our app as if it was opened on a touch device.<\/p>\n\n\n\n<p>With Cypress we can do something very similar. There is an <code>ontouchstart<\/code> property which is present on a mobile browser. This is usually a very good clue for a web application to &#8220;know&#8221; that it is being opened on a touch device. In Cypress, we can add this property manually, and make our application &#8220;think&#8221; it is being opened on a touch device:<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-rich is-provider-embed-handler wp-block-embed-embed-handler\"><div class=\"wp-block-embed__wrapper\">\n<div class=\"oembed-gist\"><script src=\"https:\/\/gist.github.com\/filiphric\/84b89265f8c948523e43f686ae68c66d.js\"><\/script><noscript>View the code on <a href=\"https:\/\/gist.github.com\/filiphric\/84b89265f8c948523e43f686ae68c66d\">Gist<\/a>.<\/noscript><\/div>\n<\/div><\/figure>\n\n\n\n<p>With the <code>onBeforeLoad<\/code> function, we tap into the window object and add the property manually, essentially creating a similar situation as we did in DevTools, when we toggled the &#8220;touch&#8221; option:<\/p>\n\n\n\n<p><img decoding=\"async\" src=\"https:\/\/app14743.cloudwayssites.com\/wp-content\/uploads\/2021\/11\/touch-device-or-not-cypress.jpg\" alt=\"displays whether we\u2019re viewing the page on a computer that is a touch device, or one that is not, in Cypress.\"><\/p>\n\n\n\n<p>To go even further with testing a touch interface I recommend using Dmitryi Kovalenko\u2019s<a href=\"https:\/\/github.com\/dmtrKovalenko\/cypress-real-events\"> cypress-real-events plugin<\/a> that fires events using Chrome devtools protocol. Your Cypress API will now get augmented with <code>cy.realTouch()<\/code> and <code>cy.realSwipe()<\/code> commands, which will help you test touch events.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-testing-with-user-agent\"><a><\/a><strong>Testing with User Agent<\/strong><\/h2>\n\n\n\n<p>Some applications use information from user agent to determine whether an app is being viewed on mobile device. There are some<a href=\"https:\/\/github.com\/juliangruber\/is-mobile\/blob\/master\/index.js\"> <\/a><a href=\"https:\/\/github.com\/juliangruber\/is-mobile\/blob\/master\/index.js\">neat plugins out there<\/a> that are commonly used in web applications to help with that.<\/p>\n\n\n\n<p>Although User Agent might sound like a super complicated thing, it is actually just a string that holds information about the device that is opening a web application. Cypress allows you to change this information directly in the <code>cypress.json<\/code> file. The following setup will set the user agent to the exact same value as on an iPhone:<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-rich is-provider-embed-handler wp-block-embed-embed-handler\"><div class=\"wp-block-embed__wrapper\">\n<div class=\"oembed-gist\"><script src=\"https:\/\/gist.github.com\/filiphric\/6599ba67999fe415479ab4ecc9b67de0.js\"><\/script><noscript>View the code on <a href=\"https:\/\/gist.github.com\/filiphric\/6599ba67999fe415479ab4ecc9b67de0\">Gist<\/a>.<\/noscript><\/div>\n<\/div><\/figure>\n\n\n\n<p>However, you might not want to change the user agent for all of your tests. Instead of adding the user agent string to <code>cypress.json<\/code> you can again tap into the <code>onBeforeLoad<\/code> event and change the viewport on your browser window directly:<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-rich is-provider-embed-handler wp-block-embed-embed-handler\"><div class=\"wp-block-embed__wrapper\">\n<div class=\"oembed-gist\"><script src=\"https:\/\/gist.github.com\/filiphric\/deae1e99b6407afd0115341701bcb272.js\"><\/script><noscript>View the code on <a href=\"https:\/\/gist.github.com\/filiphric\/deae1e99b6407afd0115341701bcb272\">Gist<\/a>.<\/noscript><\/div>\n<\/div><\/figure>\n\n\n\n<p>The reason why we are not changing <code>win.navigator.userAgent<\/code> directly via the assignment operator (<code>=<\/code>) is that this property is not directly configurable, so we need to use the <code>defineProperty<\/code> method. Opening our application in this way will, however, cause our application to render a message that it is being viewed on mobile device:<\/p>\n\n\n\n<p><img decoding=\"async\" src=\"https:\/\/app14743.cloudwayssites.com\/wp-content\/uploads\/2021\/11\/mobile.jpg\" alt=\"shows that we are viewing this page on a mobile\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-conclusion\"><a><\/a><strong>Conclusion<\/strong><\/h2>\n\n\n\n<p>You cannot test native mobile apps with Cypress, but you can get pretty close with mobile web apps. Combining these three methods will help you narrowing the gap between desktop and mobile testing. To understand what makes an app behave differently, it is nice to look into your app as a developer at least for a little while.<\/p>\n\n\n\n<p>If you enjoyed this blogpost, make sure to head over to my<a href=\"https:\/\/filiphric.com\"> <\/a><a href=\"https:\/\/filiphric.com\">personal blog for some more Cypress tips<\/a>.<\/p>\n\n\n\n<div class=\"wp-block-group pt-none pb-none\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<h2 class=\"wp-block-heading\" id=\"h-quick-answers\">Quick Answers<\/h2>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1731025092682\"><strong class=\"schema-faq-question\">Can Cypress be used to test native mobile apps?<\/strong> <p class=\"schema-faq-answer\">No, Cypress is not suitable for testing native mobile apps. It is best used for testing applications that run in a browser, such as mobile web apps.<br\/><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1737128101547\"><strong class=\"schema-faq-question\">How can I test different screen sizes in Cypress?<\/strong> <p class=\"schema-faq-answer\">You can use the\u00a0<code>cy.viewport()<\/code>\u00a0command to set specific screen dimensions or predefined device sizes. This helps ensure your app&#8217;s responsive design works across various screen widths.<br\/><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1737128117212\"><strong class=\"schema-faq-question\">Can I test touch screen interactions with Cypress?<\/strong> <p class=\"schema-faq-answer\">Yes, you can simulate touch interfaces in Cypress using the\u00a0<code>onBeforeLoad<\/code>\u00a0event to mock touch properties or by using plugins like\u00a0<code>cypress-real-events<\/code>\u00a0for touch and swipe events.<br\/><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1737128132646\"><strong class=\"schema-faq-question\">How do I test my app&#8217;s behavior based on user agents?<\/strong> <p class=\"schema-faq-answer\">Cypress allows you to customize the user agent in tests by modifying it via the\u00a0<code>onBeforeLoad<\/code>\u00a0event or configuring it with plugins. This lets you test how your app responds to different devices.<br\/><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1737128148345\"><strong class=\"schema-faq-question\">What plugins are helpful for mobile web testing in Cypress?<\/strong> <p class=\"schema-faq-answer\">Plugins like\u00a0<code>cypress-real-events<\/code>\u00a0can simulate real user interactions, and tools like Applitools assist with visual testing across devices for enhanced validation.<br\/><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1737128165729\"><strong class=\"schema-faq-question\">Can Cypress handle CSS responsiveness testing?<\/strong> <p class=\"schema-faq-answer\">Yes, running tests across multiple viewport sizes can validate CSS responsiveness. For more detailed visual checks, consider integrating Cypress with visual testing tools.<br\/><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1737128181011\"><strong class=\"schema-faq-question\">What makes mobile web app testing different from desktop testing?<\/strong> <p class=\"schema-faq-answer\">Mobile testing considers factors like screen size, touch interfaces, and user agent details. These differences require specific testing strategies to cover various device behaviors.<br\/><\/p> <\/div> <\/div>\n\n\n\n<div class=\"wp-block-group pb-none pt-none\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<style>\n.schema-faq-section { \n  background: white;\n  margin: 1rem 0;\n  border: 2px solid rgba(0, 0, 0, 0.13);\n  border-radius: 10px;\n  box-shadow: 2px 2px 6px 2px rgba(0, 0, 0, 0.03);\n}\n.schema-faq-question{\n  cursor: pointer;\n  display: flex;\n  align-items: center;\n  transition: opacity ease 0.25s;\n  padding: 1rem;\n  color: var(--wp--preset--color--primary);\n  font-size: var(--wp--preset--font-size-large);\n}\n.schema-faq-question:hover {\n  color: var(--wp--preset--color--secondary);\n}\n.schema-faq-question:after{\n  width: 16px;\n  height: 20px;\n  display: inline-block;\n  margin-left: auto;\n  margin-right: 5px;\n  vertical-align: top;\n  color: inherit;\n  content: \"+\";\n}\n.schema-faq-question.expanded:after{\n  content: \"-\";\n}\n.schema-faq-question:hover{\n  opacity: 0.75;\n}\n.schema-faq-answer{\n  padding: 0 1rem 1rem 1rem;\n  display: none;\n}\n.schema-faq-answer.default{\n  display: block;\n}\n.editor-styles-wrapper .schema-faq-question {\n  cursor: text;\n}\n.editor-styles-wrapper .schema-faq-answer {\n  display: block; \n}\n<\/style>\n\n\n\n<script>\njQuery(function($){var yoast={accordion:function(){var isAnimating=!1;$(\".schema-faq-section\").find(\".schema-faq-question\").click(function(event){event.stopPropagation();if(isAnimating)return;isAnimating=!0;var answer=$(this).nextAll(\".schema-faq-answer\").eq(0);answer.slideToggle(250,function(){$(this).toggleClass(\"expanded\");$(this).prev(\".schema-faq-question\").toggleClass(\"expanded\");isAnimating=!1});$(\".schema-faq-answer\").not(answer).slideUp(\"fast\",function(){$(this).removeClass(\"expanded\");$(this).prev(\".schema-faq-question\").removeClass(\"expanded\")})})}};yoast.accordion()});\n<\/script>\n<\/div><\/div>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Cypress is sometimes known as a tool for testing anything that runs in a browser. Here&#8217;s how you can do mobile testing on the browser with mobile web apps.<\/p>\n","protected":false},"author":64,"featured_media":32383,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[10004],"tags":[10357,12691,12783,10103,12690],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.5 (Yoast SEO v24.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to Test a Mobile Web App in Cypress - AI-Powered End-to-End Testing | Applitools<\/title>\n<meta name=\"description\" content=\"Cypress is sometimes known as a tool for testing anything that runs in a browser. 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This lets you test how your app responds to different devices.<br\/>","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/app14743.cloudwayssites.com\/blog\/how-to-test-mobile-web-app-cypress\/#faq-question-1737128148345","position":5,"url":"https:\/\/app14743.cloudwayssites.com\/blog\/how-to-test-mobile-web-app-cypress\/#faq-question-1737128148345","name":"What plugins are helpful for mobile web testing in Cypress?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Plugins like\u00a0cypress-real-events\u00a0can simulate real user interactions, and tools like Applitools assist with visual testing across devices for enhanced validation.<br\/>","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/app14743.cloudwayssites.com\/blog\/how-to-test-mobile-web-app-cypress\/#faq-question-1737128165729","position":6,"url":"https:\/\/app14743.cloudwayssites.com\/blog\/how-to-test-mobile-web-app-cypress\/#faq-question-1737128165729","name":"Can Cypress handle CSS responsiveness testing?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Yes, running tests across multiple viewport sizes can validate CSS responsiveness. For more detailed visual checks, consider integrating Cypress with visual testing tools.<br\/>","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/app14743.cloudwayssites.com\/blog\/how-to-test-mobile-web-app-cypress\/#faq-question-1737128181011","position":7,"url":"https:\/\/app14743.cloudwayssites.com\/blog\/how-to-test-mobile-web-app-cypress\/#faq-question-1737128181011","name":"What makes mobile web app testing different from desktop testing?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Mobile testing considers factors like screen size, touch interfaces, and user agent details. 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