    @Test
    public void testHelloWorldServiceUsingBlockingStub() {

        GreeterGrpc.GreeterBlockingStub client = GreeterGrpc.newBlockingStub(channel);
        HelloReply reply = client
                .sayHello(HelloRequest.newBuilder().setName("neo-blocking").build());
        assertThat(reply.getMessage()).isEqualTo("Hello neo-blocking");
    }