Angular-Mock override parent directive and mock it

I am trying to mock a directive that resides on the same module of it's parent. Since i want to isolate the test to just the child directive i am trying to mock the parent. It would be easily feasible if they both resided on different modules but since they are on the same i get multiple directives with the same name. To bypass that i tried to put something like this on my mock directive:

        return {
                priority: 100,
                terminal:true,
                restrict:'CE',
                scope:{
                    zoom:'@'
                },
                template:'<div ng-transclude></div>',
                controllerAs:'parentController',
                controller:mockController,
                transclude: true
            };

The problem is that while i can override the parent directive doing so, the child directive is never called since it has a lower priority and terminal will halt the execution.

What i am in search of is a way to override a directive definition while testing on karma-jasmine and using angular.mock.