code: def test_get_client_type():
      assert issubclass(get_client_type("127.0.0.1"), SocketClient)
      assert issubclass(
          get_client_type("unixsocket:///1"), UnixSocketClient
      )
      assert issubclass(get_client_type("dummy://"), DummyClient)
  
file_path: mars/mars/oscar/backends/communication/tests/test_comm.py
imports: import asyncio
  import multiprocessing
  import sys
  from typing import Union, List, Tuple, Type, Dict
  import numpy
  import pandas
  import pytest
  from .....lib.aio import AioEvent
  from .....tests.core import require_cudf, require_cupy
  from .....utils import get_next_port
  from ..None import SocketChannel, SocketServer, UnixSocketServer, DummyChannel, DummyServer, get_client_type, SocketClient, UnixSocketClient, DummyClient, Server
label_desc: Use image node_id 3 for calling a global function with example usage: test_get_client_type() without return types