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A JavaScript error in an E2E test with Selenium will not cause your test to fail. This may cause you to miss errors in your frontend code. Using the BrowserConsole...

...spec has ended: RSpec.configure do |config| config.after do BrowserConsole.assert_no_errors! end end Ignoring JavaScript errors for a spec We can configure RSpec to ignore JavaScript errors in specs tagged...

Capybara provides execute_script and evaluate_script to execute JavaScript code in a Selenium-controlled browser. This however is not a good solution for asynchronous JavaScript. Enter evaluate_async_script...

done("some result") }) JS Finally, you can pass additional object from Ruby to Javascript: result = page.evaluate_async_script(<<~JS, arg1, arg2) let [arg1, arg2, done] = arguments doSomethingAsynchronous().then(() => {