Mocked Service in a Directive

The idea is to mock the service based on the gist. Where the service is redefined and then the injection happens, the new overwritten service is used by the directive/controller.

How it's possible to inject the overwritten on the directive? The following snippet shows how it's inserted on the controller:

beforeEach(inject(function($controller, $rootScope, _UserService_) { // inject mocked service
    scope = $rootScope.$new();

    ctrl = $controller('MyController', {
        $scope: scope,
        UserService: _UserService_
    });

}));