Rails 6 adds tools for Action Cable testing.

Testing Action Cable prior to Rails 6Prior to Rails 6, there were no tools for testing Action Cable functionality provided out of the box. One can use action-cable-testing gem which provides test utils for Action Cable.Rails 6 adds tools for Action Cable testingIn Rails 6, the action-cable-testing gem was merged into Rails, in addition to other additional utilities. so now we can test Action Cable functionalities at different levels.