    @Test
    public void testWithAttachments() {

        URL url = URL.valueOf("test://test:11/test?group=dubbo&version=1.1");
        Invoker<DemoService> invoker = new MyInvoker<DemoService>(url);
        Invocation invocation = new MockInvocation();
        Result result = contextFilter.invoke(invoker, invocation);
        assertNull(RpcContext.getContext().getInvoker());
    }