    @Test
    public void testNullServiceInterface() {

        LoadBalanceProxyFactoryBean loadBalanceProxyFactoryBean = newLoadBalanceProxyFactoryBean(null, null);

        try {
            loadBalanceProxyFactoryBean.afterPropertiesSet();
            Assert.fail("loadBalanceProxyFactoryBean with null service interface property should throw exception.");
        } catch (Exception e) {
            Assert.assertNotNull("exception should not null.", e);
        }
    }