code: def test_timestamp():
      """This tests: google.protobuf.Timestamp are represented as date-time"""
      assert (
          PROTO_TO_PYDANTIC_MODELS.RouteProto().schema(by_alias=False)[
              "properties"
          ]["start_time"]["type"]
          == "string"
      )
      assert (
          PROTO_TO_PYDANTIC_MODELS.RouteProto().schema(by_alias=False)[
              "properties"
          ]["start_time"]["format"]
          == "date-time"
      )
  
file_path: jina/tests/unit/serve/runtimes/gateway/http/test_models.py
imports: import pydantic
  import pytest
  from jina.serve.runtimes.gateway.models import PROTO_TO_PYDANTIC_MODELS, JinaRequestModel
label_desc: Use image node_id 3 for calling a global function with example usage: test_timestamp() without return types