The simplest way is to open the page index_with_jquery.html or index_without_jquery.html in the test folder. It starts the tests on opening.
For more detailed informations, such as the test coverage, you'll need to install the dependencies:
yarn install
npm install
Then start the tests :
yarn test
You can find the test coverage informations in the 'coverage' folder.
Some of the tests fail on Internet explorer (tested on IE11, works fine on Edge). It's because the tests are particularly stricts, and IE seems to render things slightly differently (different order of attributes, and different encoding on quotes); but it still works fine.