如何在JUnit测试过程中，用Mock替换springContext中的Bean

如何在JUnit测试过程中，用Mock替换springContext中的Bean

      
        ServiceClientFacade mock  =  createMock(ServiceClientImpl. class );
        
        ApplicationContext ac  =   new  ClassPathXmlApplicationContext( " classpath:/applicationContext.xml " );
        AbstractRefreshableApplicationContext acc  = (AbstractRefreshableApplicationContext)ac;
        DefaultListableBeanFactory bf  =  (DefaultListableBeanFactory)acc.getBeanFactory();//get the beanFactory
        bf.destroySingletons();//清除已经实例了的singleton bean
        RootBeanDefinition rbd  =   new  RootBeanDefinition(mock.getClass());
        bf.registerBeanDefinition( " serviceClient " , rbd); //注册mock bean
        ServiceClientFacade m  =  (ServiceClientFacade)ac.getBean( " serviceClient " );//get mock bean
        //下边是一些测试代码，供参考
        OpportunityFacade oppFacade  =  (OpportunityFacade)ac.getBean( " oppFacade " );
        oppFacade.saveQuote( null , null );
        System.out.println(m.closeNspProcess( "" ));