Perceptual diff extension for Behat
A perceptual diff extension for Behat to highlight visual regressions in web applications.
After each step a screenshot is taken and compared with the screenshot from a previous baseline test run. Any differences will be highlighted and output in the HTML report for inspection.
For more on the benefits of perceptual diffs see @bslatkin's great video:
Download Selenium2 standalone server package and run the JAR
java -jar selenium-server-standalone-2.33.0.jar
brew install imagemagick
Install Composer dependencies
composer install --dev
Run the example tests
cd example && ../vendor/bin/behat --format=pretty,html --out=,report.html
- Brett Slatkin for his brilliant presentation on how they use perceptual diffs at Google.
- Pete Hunt for his Huxley tool that also inspired this project.
- Tom Graham - Project lead