Visual Regression Testing Vue

When snapshots are called from within your e2e tests, Percy will render a full page screenshot–across different browsers and responsive widths:. In this talk I will discuss how I converted PhantomCSS, a tool for visual regression testing, and integrated it into our workflow. Visual regression testing and functional testing each have their own technologies that best fit each context. Base R contains most of the functionality for classical multivariate analysis, somewhere. Such tests can be done manually (it often happens), but depending on the size of a project it can take a lot of efforts and be time-consuming. We then have several aggregated tests that bring all the macros together into a single module that we can run. Watch this video for a complete understanding of all the components of this important analytic tool. Visual Perspective combines expertise in data science, visualization, GIS, and remote sensing. quality of visual models in languages such as UML, SysML or BPMN, but also in domain-speci c visual languages. Under Regression testing, test cases are run and then a result is compared with the previously recorded results. Visual regression testing for web apps. Get gentle reminders to write new tests as you type. com / stefanteixeira. It was just as hell. Visual Regression Tests for Vue. Looking for a new mattress can be a full-time job, especially if you have no idea what you are looking for. Thanks very much. 4: 90: VUE: A00-275: SAS Visual Analytics 7. The wdio command line interface comes with a nice configuration utility that helps you to create your config file in less than a minute. AU - Doi, Norihisa. The purpose is to verify that things in the new build still work according to specification and that no new bugs have been introduced in the intervening coding sessions. Visual regression testing can help cut down on QA time and effort while adding a level of precision to pattern development and stylesheet refactoring. In the end, I tend to define “regression testing” (our favorite testing). Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. • The support vector regression model is used to obtain predicting results. Example of argus eyes visual regression testing baseline current diff Authors. The "Visual Regression Testing Questions" Lesson is part of the full, Testing JavaScript Applications (feat. For example. “Regression” is defined as “a return to a former or less developed state. This tutorial teaches you how to use and interact with web components in a Vue application. Automated Visual Testing is a quality assurance process meant to automatically verify that a UI visually appears as intended. In order to make one, you. Run periodically against Vue. Visual GUI testing uses image recognition to nd visible objects on the screen and has several advantages over previous techniques for GUI testing. Need help making a map, interactive visualization, or just making sense of your data?. TDD is less about testing, and more about designing the code. We change the labels to German, make the forests a bit darker and greener and change the width of main roads at lower zoom levels. We can now write fairly comprehensive tests using a technique called visual regression testing. Clone the openfast repo and initialize the testing database. System Engineer Tata Consultancy Services October 2015 – July 2018 2 years 10 months. In this session we will take a look at one of those tools -- Webdriver. Here, we will discuss on how to use. Visual regression testing targets specific areas of visual concepts like layouts, responsive design, graphics, and CSS. Regression testing is a conceptual term which means running a bunch of automated tests periodically to find product regressions. by Jim White | Feb 25, 2013. If you are working on things with a lot of repetitive testing/code changes, for primarily manual testers and those with little programming knowledge, crafting a lot of basic tests is a time saver. Previously conducted tests should be run again, and their results can be compared to current test results. It’s hard to test visuals. The latest Tweets from Backtrac (@backtracio). css files did not mess something up with the way the page renders for the user. In short, if the difference exceeds a certain threshold, the test will fail. AU - Koju, Toshihiko. Flexible visual regression testing service. Why should I learn Visual Regression Testing? Because this is what happens when you change the CSS: How can Visual Regression Testing help? Computers are actually pretty good at spotting differences between images. Visual validation is a relatively new concept that can be used to enhance existing automated tests and provide an easy way to perform those difficult checks for things like UX, localization, usability, responsive design, and cross-device testing. Applitools Eyes was added by ekungurov in Nov 2016 and the latest update was made in Jul 2019. js building blocks of HTML, CSS, and JavaScript. Instead of testing the code underneath, visual testing is all about what end users actually see and interact with. io -- discuss what it takes to get a test environment set up to execute visual regression tests using Webdriver, and how you can write visual regression tests and conduct cross browser testing using online services such as BrowserStack, Sauce Labs or TestingBot. Regression testing for CX runs tests that take the customer’s perspective and determines if the customer experience has been affected. In this session we will present a fast and easy way to do visual regression testing. For example, if you wanna test that a button hasn't change its styling, you take a base screenshot of a button, and then every time the test suite is run, a new screenshot is taken and it's compared pixel by pixel with the base screenshot. Visual Regression Test. React and Redux) course featured in this preview video. Developer Community for Visual Studio Product family VSTS: Unable to directly create new test plans, suites or cases in Test Hub visual studio for load test. 0) Released; Smoke, Sanity and Regression Testing: The River Analogy. We've tried a few visual testing tools at work and decided to go with Pixdiff/pixel-diff, though we had to invest some time learning its internals and fine tuning it before using it reliably on a pipeline. This was needed in order to customize Test Plan and Test Suite artifacts. Multiple regression is an extension of simple linear regression. For information about the option settings of the Visual Studio Test task, see Visual Studio Test task. Automated Testing Automated testing is trending in the software industry as it is easy to artificially create worst-case scenarios with automated testing tools where web apps can crash. Silk4NET is effective for regression, cross-platform and localization testing, including complex test cases and short testing cycles. io is a nifty website testing tool created by Gizra on Drupal 7. HP has been updating the software on a regular basis to help users to test modern software applications in. This is an example project for the following article: Visual Regression Tests for Vue. By running npm run test:visual-regression in your CLI utility of choice, you can start the visual regression tests. You can run multiple cycles of test runs and all visual changes collected from one to another, are detected by Applitools servers and. What is Behavioral Regression Testing?. Python Visual Regression Testing. What is Visual Regression Testing? Visual regression testing is a way of comparing screenshots of the site with the baseline screenshots. vTest is. Storybook Component Testing Instantly get visual tests across your React, Vue & Angular components. Then we add both the screenshot addon and VisWiz. In this post, I am going to list some best Regression testing tools for automated regression testing. It works with both one-page apps built in plain html or vue. We will use the Visual Studio 2017 Community to guide you through the creation and execution of an NUnit test. First, I'll show you how to capture screenshot images on a Docker image. We also have the official Vue Test Utils which provides more detailed guidance for custom setups. When you click a point on the regression line, the program will give the x-value and the f(x) value calculated using the regression equation. Cypress makes it easy to set up, write, run, and debug tests. Intern is a modern, flexible, open source JavaScript testing stack from SitePen and the JS Foundation for tests authored in JavaScript, ES6+, or TypeScript. The Four Levels of Software Testing Written by LaTonya Pearson on September 11, 2015 Before Segue releases an application, it undergoes a thorough testing process to ensure that the app is working in the manner in which it was intended. Ontologies usually come without a style sheet. Hamburg, Germany – 2012-10-17 froglogic GmbH today announced the availability of an Squish integration plugin for Microsoft Visual Studio, Team Foundation Server (TFS) and Microsoft Test Manager (MTM). T1 - Regression test selection based on intermediate code for virtual machines. This thesis aims to investigate the deployability of automating regression tests for a Command, Control and Communication system at Saab AB, using visual GUI testing. Today we'll show you how to use Intern's Visual Regression plugin to test for visual changes using a simple web page. Visual Regression Testing Democratised Without a line of code. Software testing multiple choice Questions. js storybook VisualRegressionTest 画像回帰テスト. There are a large number of packages on CRAN which extend this methodology, a brief overview is given below. By replacing unavailable dependencies with easily-accessible and configurable "virtual assets," service virtualization allows teams to start testing earlier, test more completely, and test continuously. Any differences between these two images causes the test to fail. Responsive layouts are very difficult to test. In the real world, automatic test coverage of 100% of a code base represents an ideal goal that can't be achieved. With subtle changes it is difficult to detect what actually happened and what impact the changes have. When you execute a regression test, the Model Regression Test Tool applies the request associated with the test case on the modified model and compares the response with the baseline. In this talk, I discuss what visual regression testing is, how its used, briefly discuss existential programming dilemma of choosing a tool, then choose one that fits and a code demo with best. jQuery, Vue. Besides, humans are innately bad at spotting minor visual differences. Js Applications with Jest and Puppeteer. #image-diff #snapshot; Cypress Visual Regression. Applitools Eyes was added by ekungurov in Nov 2016 and the latest update was made in Jul 2019. Regression testing allows finding such changes. Visual regression tests can track any breaking style changes. TLTR: it will capture images as a baseline for the first run, then compare with the images from the next run!That's it. Because modern mobile applications are built as hybrid and native applications, there is no way to scale this sort of testing using manual resources, so visual test automation must be a crucial piece of the testing stack. Sixsentix enables clients to reduce their test maintenance while optimizing test automation and reusability. With Puppeteer you can choose whether to launch Chromium in headless mode or not (tests run faster in headless mode, but it's useful to be able to see the browser and run the test in slow motion for debugging purposes). Find articles, video tutorials about visual testing, and browse our list of testing tools to get your project up and running. Manual testing is an option for smaller sites, but much less efficient as websites become bigger and more complex. This may include testing load times, animations, and other things that are not taken into account in a controlled render environment. • The support vector regression model is used to obtain predicting results. Teams share their Storybook with colleagues to confirm visual requirements are mitigate bugs. We change the labels to German, make the forests a bit darker and greener and change the width of main roads at lower zoom levels. How to specify a regression analysis model. A simple visual regression test with PhantomCSS. Maintenance of Regression Testing can be a very daunting exercise. st for lots of information on other visual regression tools. By replacing unavailable dependencies with easily-accessible and configurable "virtual assets," service virtualization allows teams to start testing earlier, test more completely, and test continuously. Smart Visual Testing feature allows you to test and compare two image layouts to quickly find out the differences between them. The t-test as a Special Case of Regression. And when considering adding visual testing to your test framework make sure you choose the right tool that can help you identify the issues quickly and reliably, don’t settle for simple bitmap comparison as it will not work in the test case above. js applications. Find articles, video tutorials about visual testing, and browse our list of testing tools to get your project up and running. Like unit tests, TDD tests can be used for regression testing. Engineers can now easily write tests to benchmark sections of code, test for accessibility (a11y) support, and test for visual differences. Africa (8) Asia (20) Europe (172) North America (75) Oceania (4) South America (10). Whatever way you choose to get started with visual testing, it is all a matter of taking the first step. Tools and Tips for Automated Visual Regression Testing. Visual regression. Participate in all aspects of automation testing including establishing metrics, applying industry best practices and developing new tools and processes to ensure quality goals are met. When parsing a web site SeeShell tries to find the test image or text anywhere on the website. In this post, I am going to list some best Regression testing tools for automated regression testing. The list of alternatives was updated Sep 2019. Galen is an open source layout testing tool for software applications which allows to test the look and feel of the application. Visual testing (sometimes called visual regression testing or UI testing) is the process of reviewing software for purely visual integrity. Loren works at Big Nerd Ranch as a Senior Developer and researches methods for testing front-end frameworks such as Vue. At the same time, businesses can further use UFT to automate functional and regression testing of both applications and environments. At the beginning of my story, I was firmly convinced that there was no “regressive” testing, then the source multitran. Can anyone suggest automated regression testing tools they use for the. How to interpret basic regression. Teams share their Storybook with colleagues to confirm visual requirements are mitigate bugs. Besides these testing activities, one of the test type which is considerably getting crucial, is visual regression testing. Regression analysis is the study of two variables in an attempt to find a relationship, or correlation. Besides these testing activities, one of the test type which is considerably getting crucial, is visual regression testing. Test - driven development is an approach where the application tests are defined prior to the development of the application code. We change the labels to German, make the forests a bit darker and greener and change the width of main roads at lower zoom levels. Using Backstop. There are two types of supervised machine learning algorithms: Regression and classification. But the general thumb rule of what is Unit in Unit testing is that the module self contained and by itself. Visual Regression Tests for Vue. io -- discuss what it takes to get a test environment set up to execute visual regression tests using Webdriver, and how you can write visual regression tests and conduct cross browser testing using online services such as BrowserStack, Sauce Labs or TestingBot. VT Netzwelt offers a wide range of QA and software testing services that adhere to the highest level of industry standards. The approach is to take screen shots of the web page. Visual Regression testing. The purpose is to verify that things in the new build still work according to specification and that no new bugs have been introduced in the intervening coding sessions. Many of our exams are available through their testing center network. We will have test case scripts written in CasperJs. Add your own interactions with Puppeteer and ChromyJS scripting. Visual regression. js is a popular JavaScript library for building web application user interfaces and Visual Studio Code has built-in support for the Vue. For example, if a company changes the price on a certain product several times, it can record the quantity it sells for each price level and then performs a linear regression with quantity sold as the dependent variable and price as the explanatory. How to use Page Objects Model with Puppeteer. This is a follow-up to my last article about about how to create Visual Regression Tests with Jest and Puppeteer for Vue. Compares the visual PDF output, not the underlying code: new file = or ≠ reference file. PhantomCSS takes screenshots captured by CasperJS and compares them to baseline images using Resemble. There are various steps for manual testing, such as unit testing, integration testing, system testing, and user acceptance testing. A default ontology style sheet is already in VUE. js dev branch. Whether used as a basic smoke test, or more detailed testing to prevent visual regressions, BackstopJS is a very useful tool, and has quickly become an important part of our commitment to code quality. Africa (8) Asia (20) Europe (172) North America (75) Oceania (4) South America (10). Visual Regression Testing aims to help us here by having a computer detect the differences for us. Regression analysis will provide you with an equation for a graph so that you can make predictions about your data. TLTR: it will capture images as a baseline for the first run, then compare with the images from the next run!That's it. If we had had visual regression testing, this regression would have been caught during the pull request, and this breaking change would never have been introduced into production. Applitools is an automated visual regression testing framework. Different teams There might be different teams working on each layer of tests; therefore it can become easier to manage permissions, merges, tasks, etc. Visual Regression Testing for Storybook. In this webinar replay we will take a closer look at the importance of visual regression testing as part of any continuous delivery project. Despite this knowledge, many of us don't bother writing automated regression tests, as we feel it's just too much work to set up and maintain. I am not sure why you would want separate regressions, but to get rows (or columns) alone you can perform one-way Anova using Regression as described on the referenced webpage. PDF | After reading this chapter, you should understand: What regression analysis is and what it can be used for. Regression testing for CX runs tests that take the customer's perspective and determines if the customer experience has been affected. Teams share their Storybook with colleagues to confirm visual requirements are mitigate bugs. They might be useful for projects with large code bases and a lot of styles, but I am fine with just snapshots. Tried to search after sss: no matches expected, but Permissions and Visual regression tests are still highlighted. Developer Advocate. My email alias is billbar (at microsoft. Regression analysis will provide you with an equation for a graph so that you can make predictions about your data. automated-testing automated-testing-tools test-automation testing visual-testing. Knowledge of Manual Test Case design, Web Testing, Database testing, Black box testing, regression testing. Create the Test Project. Visual Regression Testing with BackstopJS. Are you dedicating valuable mental energy towards manually testing for unexpected defects in the parts of the app where you're not actively working?. By Garris Shipon on February 16, 2015. Retrieved from website. And which option will offer the most benefit to identifying changes within your web application. Snapshot Testing is a type of Regression Testing which is intended to verify that a previously developed and tested Software performs correctly after change. Any differences between these two images causes the test to fail. 2 synonyms of regression from the Merriam-Webster Thesaurus, plus 8 related words, definitions, and antonyms. Have you used BackstopJS for visual regression tests? How has it helped your team?. Visual Regression Testing For Angular Applications Building Resilient Systems on AWS : Learn how to design and implement a resilient, highly available, fault-tolerant infrastructure on AWS. Can also be manually triggered by pushing to Vue. Besides these testing activities, one of the test type which is considerably getting crucial, is visual regression testing. You can also modify the one provided with the Elements below. It is simple enough to learn and allows the test to be run across various web browsers. What is Visual Regression Testing? Visual regression testing is a way of comparing screenshots of the site with the baseline screenshots. Then, after an update, you take a fresh screenshot and have the computer compare the two. A simple linear regression model takes two arguments. They are not unit tests, no application code/objects linked into the tests. To test our component's screenshots we will write our own utility and I will explain it to you so that you can create your own solutions. Services Case studies Case studies. Also, it supports some WebDrivers: Selenium Server, Chrome Driver, PhantomJS and cloud WebDrivers, like BrowserStack or SauceLabs. Cypress client library for visual regression testing with Percy (https://percy. That's why Infostretch is here to help you deliver the highest quality digital services without disruption. I decided to go with BackstopJS. There are a few ways to do visual regression testing that are worth considering. Regression analysis will provide you with an equation for a graph so that you can make predictions about your data. Develop testing scenarios/cases to address areas such as database impacts, software scenarios, regression testing, boundary/negative testing, usability. That was the moment when I decided to take the idea that John Munsey introduced me to and create an automated visual regression test suit. Whilst Stata does not produce these values as part of the linear regression procedure above, there is a procedure in Stata that you can use to do so. It is not only used for functional areas, but also to visual changes (CSS). Applitools Eyes was added by ekungurov in Nov 2016 and the latest update was made in Jul 2019. Coming later to this page: How to add visual regression testing to your continuous integration setup. Have you used BackstopJS for visual regression tests? How has it helped your team?. Through a proprietary automated update system, with visual regression testing baked in, WEBDOGS minimizes the time required by humans to perform mission critical updates. For information about the option settings of the Visual Studio Test task, see Visual Studio Test task. For a visual regression test I need to compare screenshots of webpages (different release-versions). Regression testing before agile was easy. The problem that app teams discover is that visual regression testing a multi-state web app is very different than testing a collection of static pages. Visual Regression Testing has a unique set of benefits. js stack • Clients include UNICEF, (including CasperJS visual regression tests and. It can be used for analyzing the performance of windows applications. How to align test automation with agile and devops Along with CI/CD’s continuous integration and continuous development, you need continuous testing. 誤検知しがちなテストにしない (テストの信頼性が下がって、割れ窓になってしまう) インテグレーションテスト中にスクリーンショットを撮るのをやめた; アニメーションなど動きがあるものはテストできない. It is still not implemented for Nuxt or Vue, but you can tract this issue for progress. For "X" I used the date numbers (E. io for our components, we want to send the build information and screenshots to the VisWiz. Some parts of the code are very hard or even impossible to test automatically, especially code dedicated to the UI. jQuery, Vue. Automated visual regression testing helped us find and fix regressions before it became the client’s problem. Pros: Screenster is a great record and playback automated test tool which is great for recording regression test cases. Ran by the developer on their local development environment after changes made to ensure no regressions issues have occurred due to their changes. It was a long awaited requirement that Test Plan and Test Suite be provided as a work item. I have worked for many software projects, so hope my recommendations below are helpful to you. Visual Regression testing tries to solve this problem by taking a screenshot of the UI and comparing that with a previous version. It was invented in the early. In this case, we will be testing the results of the execution of a stored procedure. These Regression Testing Best Practices and tips can help you create maintainable and useful regression pack. It can also simulate user interactions with ChromyJS or CasperJS. Implement Visual Regression Testing using jest-image-snapshot library. Visual regression tests can track any breaking style changes. Here, we will discuss on how to use. Practice exams on the Pearson VUE platform are the new SAS practice exam standard and are designed to be as representative as possible to the actual exam in difficulty level, objective coverage, length, and look and feel. Effectively an extension of the CasperJS library, which is itself built upon the PhantomJS engine, PhantomCSS is a javascript library that allows fully automated regression testing of your stylesheets. I'm not sure how you feel, but I consider myself a backend developer. Visual Regression Testing Testing things because things getting messy makes me twitchy and people don’t like it when I get twitchy. Visual Regression Testing for Storybook. Next we can move on to our Visual Regression Test now that we have seen the basics. WebdriverCSS also integrates well with test frameworks like Mocha, Jasmine and Cucumber. Tips and Tricks for various real world use cases. make sure the page looks the same as before). Run periodically against Vue. Cypress client library for visual regression testing with Percy (https://percy. Testing OpenFAST¶ The OpenFAST test suite consists of system and module level regression tests and unit tests. Visual regression testing is the testing of visual changes during the evolution process of the system. Front-end Testing. It is an open source Node. Real world End-to-End testing. For this purpose, the idea of regression testing which is a well-known paradigm in software engineering is adapted for the domain of visual modelling. That was the moment when I decided to take the idea that John Munsey introduced me to and create an automated visual regression test suit. Visual testing (sometimes called visual regression testing or UI testing) is the process of reviewing software for purely visual integrity. AUTOMATED VISUAL REGRESSION TOOL for Websites and UI Designs. How to use regression in a sentence. js stack • Clients include UNICEF, (including CasperJS visual regression tests and. Learn using Page Objects Model with Cypress. For example. CrossBrowserTesting can automatically spin up the recent and previous versions of a web page, but you have to analyze where there are bugs or inconsistencies. io for our components, we want to send the build information and screenshots to the VisWiz. Visual Perspective combines expertise in data science, visualization, GIS, and remote sensing. Micro Focus is the top solution according to IT Central Station reviews and rankings. More details on using Puppeteer to do visual regression testing can be found here. TDC 2014 SP - Visual Regression Testing com PhantomCSS 1. AUTOMATED VISUAL REGRESSION TOOL for Websites and UI Designs. It contains both paid and open source free regression testing tools. Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Microsoft Azure Machine Learning Studio is an IDE used for your estimated data that must be treated as a prediction with the purpose of analysis, testing, and distribution. Mike Douglas is a Solution Consultant at Deliveron Consulting Services. io CLI to the test script:. takeScreenShot() and compare them against the baseline. Tips and Tricks for various real world use cases. Automated Continuous Regression: I have 5000 test cases in our automation regression suite which, an automated testing tool ,will take 90 hours to execute all the test cases as most of the test cases are very complex!!! All the 5000 test cases are split into multiple suite files based on the business functionality as given below in the picture 1. A little background. Regression line and 95% prediction interval. html 2019-10-11 15:10:44 -0500. Capturing screenshots of the UI and highlighting visual changes. Visual Regression Testing Example. It was a long awaited requirement that Test Plan and Test Suite be provided as a work item. In a recent AngularJS-based job interview, the client discussed the need for Web UI regression testing. Find related Visual BI Solutions - Senior Automation Test Analyst - Regression Testing/Selenium jobs in Chennai 8 - 12 Years of Experience with Testing JUnit Selenium Javascript Regression Testing Defect/Bug Management Process Software Quality Assurance. • Create, update and review test cases based on architecture documents and standards specification • Ensure test cases are accurate and complete • Perform smoke test, functionality test on each component specified, integration tests, system testing, regression testing and acceptance testing • Identify and report defects. Implement Visual Regression Testing using jest-image-snapshot library. I started with pixel by pixel compare. QMetry Automation Studio supports multi-platform automated testing across web, web services / APIs, and mobile devices. vTest supports automated testing using both Internet Explorer and Mozilla Firefox. Here, we will discuss on how to use. Don’t let your customers find the bugs before you do!. Snapshot / Visual regression tests (Jest) Integration tests with Cypress. Styleguides with visual regression tests also help a lot. Sure - I know my way around Vue. While there are many types of regression analysis, at their core they all examine the influence of one or more independent variables on a dependent variable. For example, a banking feature allows a customer to get her checking account balance. Overall however, the violation of the homoscedasticity assumption must be quite severe in order to present a major problem given the robust nature of OLS regression. Advanced Cypress concepts and methods. How do we overcome Regression Testing challenges and ensure that any change does not impact the quality of the software deliverable? Agile development is acclaimed for delivering working software frequently, adding or enhancing features at the interests of the customer. The Importance of Visual Testing While it's clearly important to test the functional elements of your application, some teams will make the mistake of not paying enough attention to visual validation. In this talk, I discuss what visual regression testing is, how its used, briefly discuss existential programming dilemma of choosing a tool, then choose one that fits and a code demo with best. I have worked for many software projects, so hope my recommendations below are helpful to you. It is designed to operate with Intern by adding specific commands to the Leadfoot Command object. In ideal case I want to generate all automated tests right from my test cases. To test our component's screenshots we will write our own utility and I will explain it to you so that you can create your own solutions. Regression definition is - the act or an instance of regressing. org; Visual regression tests on every commit; How we could monitor Twitter (if we had to) Cross Browser Visual Regression Tests With Shoov. io -- discuss what it takes to get a test environment set up to execute visual regression tests using Webdriver, and how you can write visual regression tests and conduct cross browser testing using online services such as BrowserStack, Sauce Labs or TestingBot. Developing A Regression Software Testing Strategy. We'll build a small UI that adds people to a data grid. This form of testing does not specify an expected appearance, it just checks and highlights any differences against baseline. Addison-Wesley. Then we add both the screenshot addon and VisWiz. CasperJS provides its own test APIs (which PhantomCSS uses), and we can write simple tests such as the following:. Visual Regression Testing with BackstopJS. Visual Regression Testing is the process you go through to catch those types of things that cause us to stay up nights, clicking through your client site after you made changes, hoping you catch them before the client does. It was a long awaited requirement that Test Plan and Test Suite be provided as a work item. Tips and Tricks for various real world use cases.