What is it?

Hermione.js is a “browser test runner based on mocha and wdio”. It opens a desired browser and performs actions defined in the test suites. Tests run in parallel so the waiting process is short. Hermione has very feature-rich API to cover all your needs.

But what’s most important for us - we may take a reference screenshot of a page and then compare this screenshot each time we make a change in UI to make sure that we touched only what was intended.

A quick demo

Original reference view:

Changed view:

Diff view:

Blog post with tutorial

https://brainhub.eu/blog/regression-testing-with-selenium/

How to run the project

1. npm i
2. npm i -g hermione
3. Install https://www.npmjs.com/package/selenium-standalone
4. selenium-standalone start
5. npm install -g hermione
6. npm install html-reporter
7. Update ref images with "npm run hermione-update-refs"
8. Run tests with "npm run hermione"

Have fun!