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There is a small change to allow the application object to be injected in to allow unit tests this can be tested easily by just navigating around Joomla.
Finally as per the doc block I've typecast the result to be a boolean as it was returning the string 0 on false and 1 on true for the enabled state of the plugin (as these are the values stored in the database). Currently you get true and false in the frontend and 0 and 1 in the backend.
Testing
All the routing in the frontend depends on this class so navigate around and ensure that with plugin enabled and disabled everything works as expected.
In the backend ensure that the modal views when you are selecting a single item in the menu show everything properly