在Jasmine中，如何为每个测试注入新的工厂/服务？

Question

前提：我完全清楚服务和工厂是单身人士。

如何为每次测试重置注入的工厂？

这是我的示例代码：

describe('Test', () =>  {

    beforeEach(module('app'));

    var $scope: Registration.IRegistrationCardsScope;
    var workflow : Workflow.Registration;

    beforeEach(inject(($injector) => {                          
        $scope = $injector.get('$rootScope').$new();

        //injecting with angular, this should be a different factory each time, not a singleton
        workflow = $injector.get("registrationWorkflow");

        //actual workaround thanks to typesript, reinitializing factory manually instead of injecting
        //workflow = new Workflow.Registration(); 

    }));

    it('test factory 1', () =>  {
        workflow.getVariable(); // returns undefined <-- correct;
        workflow.setVariable(1);
     });

    it('test factory 2', () =>  {
        workflow.getVariable(); // returns 1 <-- wrong;
        workflow.setVariable(1);
    });

})

感谢任何提示！