How to set up a pipeline with visual unit tests for your application

Demo project with Typescript/React/React Testing Library/Jest.

FYI: Latest version of the project makes demo with styled-components, but you can see history (and attached videos) to discover options with css/pcss.

Features:

• Nice reports with jest-allure
• Screenshots tests with puppeteer & jest-allure-image-snapshot
• CircleCi integration

Talk

During this talk we’ll discuss why we bet on visual unit tests. On a real example we’ll discover how to implement such tests for React application with Jest and Puppeteer, we’ll meet Allure report with Jest and in the end set up the full pipeline with CircleCi and GitHub to run our own visual tests on each pull request. Also we’ll consider performance and some tricky parts.

Report example:

Available Scripts

In the project directory, you can run:

yarn start

Runs the app in the development mode.
Open http://localhost:3000 to view it in the browser.

The page will reload if you make edits.
You will also see any lint errors in the console.

yarn test

Launches the test runner in the interactive watch mode.
See the section about running tests for more information.

yarn run build

Builds the app for production to the build folder.
It correctly bundles React in production mode and optimizes the build for the best performance.

The build is minified and the filenames include the hashes.
Your app is ready to be deployed!

See the section about deployment for more information.