Rails 6 adds tools for Action Cable testing.

23-Oct-2019 1746
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.
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