Jasmine Karma test for $scope.$on

I have written test case for $scope.$on but this time I came to a little difficult scenario.

Here is the $on function:

    $scope.$on('x', function (eventName, eventData) {
        var details = _this.details;
        if (eventData.title !== details.title) {
            retu;
        }
        if (details.item1) {
            someFactory.functionA(details.item1);
        }
        if (details.item2) {
            someFactory.functionA(details.item2);
        }
    });

I want to cover test for

if (eventData.title !== details.title) {
    retu;
}

Here is what I did:

it('should not call someFactory.functionA', function () {
    spyOn($scope, '$on');
    spyOn(someFactory, 'functionA');
    $scope.item = {
        title: 'aaa'
    };

    $scope.$digest();

    var $ctrl = element.controller('someController', {$scope: $scope});
    $scope.$broadcast('x', 'eventData', 'eventType');
    expect(someFactory.functionA).not.toHaveBeenCalled();
});

This passing the test and covering the code. But the problem is even if we delete the someFactory.functionA() the test will pass. So I need some more efficient way to write this test. Please suggest.

Note: I can't change the code structure as it is freezed. Only test can be improved.