Test JavaScript Interactions with a Real Browser

If we have features that require JavaScript or won’t work if our JavaScript is broken, we need to test them in a real browser. While unit tests could help, they won’t give complete confidence because we need to see the JavaScript executing in context. Because we’ve set our system tests to use :rack_test, that means they won’t use a real browser, and JavaScript won’t be executed. We need to allow a subset of our tests to actually use a real browser (which is what Rails’ system tests do by default). ...