code: def vertex_client():
      with patch(
          f"{path}.service_account.Credentials.from_service_account_file"
      ), patch(f"{path}.aiplatform.init"):
          client = VertexClient("fake_path", "fake_project_id")
      return client
  
imports: import time
  import json
  import pandas
  import pytest
  from unittest.mock import Mock, patch
  from mindsdb_sql import parse_sql
  from tests.unit.executor_test_base import BaseExecutorTest
  from mindsdb.integrations.handlers.vertex_handler.vertex_client import VertexClient
label_desc: Use image node_id 1 for calling a global function with example usage: vertex_client() and returns: client