classdef MyHandle < handle
    events
        SomethingHappened
    end
end

classdef ListenerTest < matlab.unittest.TestCase
    methods(Test)
        function testDisabledListeners(testCase)
            h = MyHandle;
            
            % Add a listener to a test helper method
            listener = h.addlistener('SomethingHappened', ...
                @testCase.shouldNotGetCalled);
            
            % Passing scenario (code path is not reached)
            %%%%%%%%%%%%%%%%%%%%
            % Disabled listener should not invoke callbacks
            listener.Enabled = false;
            h.notify('SomethingHappened');
            
            % Failing scenario (code path is reached)
            %%%%%%%%%%%%%%%%%%%%
            % Enabled listener invoke callback and fail
            listener.Enabled = true;
            h.notify('SomethingHappened');
        end
    end
    
    methods
        function shouldNotGetCalled(testCase, ~, ~)
            % A test helper callback method that should not execute
            testCase.verifyFail('This listener callback should not have executed');
        end
    end
    
end

run(ListenerTest);