React Summit

React Summit 2024

Visual Regression Tests are like unit or integration tests but focus on the visual part, allowing developers and QA personnel to identify and address any changes. Challenges in detecting UI changes include elements that are not visible to the human eye and misalignment of elements. Use cases for Visual Regression Tests include testing design system components, responsive designs, and browser renderings. Building a Visual Regression Test Tool involves handling animations, network requests, and flakiness. Docker is the best solution for resolving visual regression issues, and finding the baseline for comparison can be challenging but is handled by the testing tool.

In our daily routines as frontend engineers, we diligently apply unit, integration, and end-to-end tests to our development processes. The primary goal of these practices is to deliver features at high velocity with confidence in the robustness of our code. It's crucial to ensure that any modifications we introduce do not inadvertently disrupt the app's functionality. However, an often overlooked aspect of software testing is the visual part. Even if your app works correctly from a functional standpoint, what if key visual elements, such as call-to-action buttons, are obscured or entirely missing from the user's view? In this talk, we will dive into the inner workings of visual regression testing. We'll explore how it functions and what steps are taken between the start and the result of such a test. We will look into the challenges it encounters along the way as well.

Behind the Scenes of a Visual Regression Test

Chris Kalmar

React Advanced

React Advanced Conference 2022

The Talk discusses the need for more robust tools for visual testing in UI development. It explores the challenges in building UIs, including multiple views, variants, and breakpoints. The importance of component extraction and interactions is emphasized. The Talk also covers story derivation from components and interactions, UI testing with the test runner, and visual regression testing with Chromatic. Automating tests using GitHub Actions and common mistakes in using Storybook are discussed. The Talk concludes with a Q&A session.

Error state, loading state, awkward breakpoint, bad data, poor formatting, browser support. Every component can result represent hundreds or thousands of discrete visual states. How do you test it? Manually disable the network — temporarily. Insert bad code — just for a minute. Paw at the edge of your screen. Hack local database fixtures to bits. Frontend development has so many dimensions. Time and variation result in an infinite number of UI possibilities. In this talk, we'll use Storybook to progressively develop, test, and document our work — automating the grunt work of UI development.

How I Test a Million UI States with Every Merge — Visual Testing with Storybook

Michael Chan

TestJS Summit

TestJS Summit 2021

Hello, I'm Rainer Haneckamp, a trainer and consultant at Angular Architects. In this talk, we'll explore visual regression testing using tools like Puppeteer, Playwright, and Cypress. We'll learn how to use Storybook and Puppeteer with Jest for visual regression testing. We'll also see how Jest and Playwright can be used together for visual regression testing. Finally, we'll discover how to use Cypress for visual regression testing. Thank you for watching!

Visual Regression tests components via screenshot matching. I'll show how you do that in three different libraries/frameworks. Additionally, I will use Storybook to extract the components from your SPA choice.

Visual Regression with Puppeteer, Playwright and Cypress

Rainer Hahnekamp

JSNation Live

JSNation Live 2020

Gleb Akhmetov explains how to visually test React components, emphasizing the importance of addressing climate change and collaboration. He discusses component testing, styling, and the challenges of CSS changes. Gleb highlights the use of image snapshots for visual testing and the importance of controlling data for accurate results. He also discusses using Docker for consistent visual testing and the support for multiple browsers. Cypress is focused on flake-free testing and has plans for test retries and new features in the roadmap.

Many modern web frameworks use components as their building blocks. In this talk, I will show component testing using Cypress - and I mean "show" literally. You will see the component running inside a real browser, you will interact with the component like a real user, and you can debug the component using the real browser's DevTools. Finally, I will go through the current open source and commercial options for visually testing the component's styles and rendering. <a href="https://www.froala.com/wysiwyg-editor?pb=1"> </a>

#visual regression testing react