Migrating Selenium system tests to Cuprite

In our project, we’ve been running system tests (then called rather "Feature tests") since around 2016. System tests use a real browser in the background and test all layers of a Rails application at once: from the database all the way up to the nuances of JavaScript loaded together with the web pages. Back then, we wrote our system tests using Capybara with Poltergeist, a driver that ran a headless Phantom JS browser. Since this browser stopped being actively developed, we migrated our test suite to the Selenium / Webdriver wrapper around Chrome browser around ~2018. Chrome was itself fine for tests automation but the Selenium API was quite limited and we had to rewrite several Poltergeist features using 3rd party gems and tools.