@BeforeEach
    public void setUp() {
        ShenyuGrpcResponse shenyuGrpcResponse = mock(ShenyuGrpcResponse.class);
        messageWriter = MessageWriter.newInstance(shenyuGrpcResponse);
    }
The Test Case For {@link MessageWriter}.
shenyu-plugin/shenyu-plugin-proxy/shenyu-plugin-rpc/shenyu-plugin-grpc/src/test/java/org/apache/shenyu/plugin/grpc/proto/MessageWriterTest.java