docstr: Test initialize gRPCProxyRequest with user defined service method.
  
  When the gRPCProxyRequest is initialized with user defined service method,
  all attributes should be setup accordingly. Calling both is_route_request
  and is_health_request should return false. `send_request_id()` should
  also work accordingly to be able to send the into back to the client.
  `request_object()` generates a gRPCRequest object with the correct attributes.
docstr_tok: ["Test","initialize","gRPCProxyRequest","with","user","defined","service","method",".","When","the","gRPCProxyRequest","is","initialized","with","user","defined","service","method",",","all","attributes","should","be","setup","accordingly",".","Calling","both","is_route_request","and","is_health_request","should","return","false",".","`","send_request_id","(",")","`","should","also","work","accordingly","to","be","able","to","send","the","into","back","to","the","client",".","`","request_object","(",")","`","generates","a","gRPCRequest","object","with","the","correct","attributes","."]
code: def test_calling_user_defined_method(self):
      """Test initialize gRPCProxyRequest with user defined service method.
  
      When the gRPCProxyRequest is initialized with user defined service method,
      all attributes should be setup accordingly. Calling both is_route_request
      and is_health_request should return false. `send_request_id()` should
      also work accordingly to be able to send the into back to the client.
      `request_object()` generates a gRPCRequest object with the correct attributes.
      """
      request_proto = serve_pb2.UserDefinedMessage(
          name="foo", num=30, foo="bar"
      )
      application = "fake-application"
      request_id = "fake-request_id"
      multiplexed_model_id = "fake-multiplexed_model_id"
      metadata = (
          ("foo", "bar"),
          ("application", application),
          ("request_id", request_id),
          ("multiplexed_model_id", multiplexed_model_id),
      )
      context = MagicMock()
      context.invocation_metadata.return_value = metadata
      method_name = "Method1"
      service_method = f"/custom.defined.Service/{method_name}"
  
      proxy_request = gRPCProxyRequest(
          request_proto=request_proto,
          context=context,
          service_method=service_method,
          stream=MagicMock(),
      )
      assert isinstance(proxy_request, ProxyRequest)
      assert proxy_request.route_path == application
      assert pickle.loads(proxy_request.request) == request_proto
      assert proxy_request.method_name == method_name
      assert proxy_request.app_name == application
      assert proxy_request.request_id == request_id
      assert proxy_request.multiplexed_model_id == multiplexed_model_id
      assert proxy_request.is_route_request is False
      assert proxy_request.is_health_request is False
  
      proxy_request.send_request_id(request_id=request_id)
      assert (
          proxy_request.ray_serve_grpc_context.trailing_metadata()
          == [("request_id", request_id)]
      )
  
      proxy_handle = MagicMock()
      request_object = proxy_request.request_object(
          proxy_handle=proxy_handle
      )
      assert isinstance(request_object, gRPCRequest)
      assert (
          pickle.loads(request_object.grpc_user_request)
          == request_proto
      )
      assert request_object.grpc_proxy_handle == proxy_handle
  
imports: import pickle
  from unittest.mock import MagicMock
  import pytest
  from ray.serve._private.common import StreamingHTTPRequest, gRPCRequest
  from ray.serve._private.proxy_request_response import ASGIProxyRequest, ProxyRequest, gRPCProxyRequest
  from ray.serve._private.test_utils import FakeGrpcContext
  from ray.serve.generated import serve_pb2
label_desc: Use image node_id 3 for calling the TestgRPCProxyRequest obj's underlying member method code with example usage: obj.test_calling_user_defined_method() without return types