CSS regression is run with a suite of gemini tests. In order to make testing easy in a variety of environments we added support for running our suite inside a Docker container.

Running tests locally depends on havingDocker installed and running.

We also needgemini and thehtml-reporter installed on the local machine.

• npm install -g gemini
• npm install -g html-reporter

There are two commands built into our npm scripts:

1. Run tests
   1. npm run test:visual:light set1 will run all the test suites in set1 for the light theme
   2. npm run test:visual:light set1/buttons.js will run the buttons.js suite of tests for the light theme
2. Update reference images
   1. npm run visual:fix:light set1 will rungemini update on all the test suites in set1 for the light theme
   2. npm run visual:fix:light set1/buttons.js will rungemini update on the buttons.js test suite for the light theme

Note: we have currently broken up the tests into two sets, set1 and set2.

1. What is Docker?
2. What is Gemini?
3. What is Selenium?