Testing AJAX Controller Requests With Different Versions of Rails and RSpec

AJAX opens a new window (Asynchronous JavaScript and XML) is an approach that combines the use of many different technologies such as HTML or XHTML, CSS, JavaScript, DOM, XML, XSLT, and most importantly the XMLHttpRequest object to provide a better user experience by allowing asynchronous behavior that avoids reloading or rerouting the user.A request can be made from the client using an asynchronous method such as the fetch API opens a new window to a server.The server will then respond with some data completing the request-response cycle.If an application is built using Ruby on Rails, it will come packed with rails-ujs which allows to inject JS behavior and provide dynamic DOM updates simply by adding ‘data’ helpers in the Rails HTML markup.