code: def test_client_deprecation_warn():
      """
      Tests that calling ray.client directly raises a deprecation warning with
      a copy pasteable replacement for the client().connect() call converted
      to ray.init style.
      """
      # Test warning when local client mode is used
      with warnings.catch_warnings(record=True) as w:
          ray.client().connect()
          assert any(
              has_client_deprecation_warn(warning, "ray.init()")
              for warning in w
          )
          ray.shutdown()
  
      with warnings.catch_warnings(record=True) as w:
          ray.client().namespace("nmspc").env(
              {"pip": ["requests"]}
          ).connect()
      expected = 'ray.init(namespace="nmspc", runtime_env=<your_runtime_env>)'  # noqa E501
      assert any(
          has_client_deprecation_warn(warning, expected)
          for warning in w  # noqa E501
      )
      ray.shutdown()
  
      server = ray_client_server.serve("localhost:50055")
  
      # Test warning when namespace and runtime env aren't specified
      with warnings.catch_warnings(record=True) as w:
          with ray.client("localhost:50055").connect():
              pass
      assert any(
          has_client_deprecation_warn(
              warning, 'ray.init("ray://localhost:50055")'
          )
          for warning in w
      )
  
      # Test warning when just namespace specified
      with warnings.catch_warnings(record=True) as w:
          with ray.client("localhost:50055").namespace(
              "nmspc"
          ).connect():
              pass
      assert any(
          has_client_deprecation_warn(
              warning,
              'ray.init("ray://localhost:50055", namespace="nmspc")',
          )
          for warning in w
      )
  
      # Test that passing namespace through env doesn't add namespace to the
      # replacement
      with warnings.catch_warnings(record=True) as w, patch.dict(
          os.environ, {"RAY_NAMESPACE": "aksdj"}
      ):
          with ray.client("localhost:50055").connect():
              pass
      assert any(
          has_client_deprecation_warn(
              warning, 'ray.init("ray://localhost:50055")'
          )
          for warning in w
      )
  
      # Skip actually connecting on these, since updating the runtime env is
      # time consuming
      with patch("ray.util.client_connect.connect", mock_connect):
          # Test warning when just runtime_env specified
          with warnings.catch_warnings(record=True) as w:
              try:
                  ray.client("localhost:50055").env(
                      {"pip": ["requests"]}
                  ).connect()
              except ConnectionError:
                  pass
          expected = 'ray.init("ray://localhost:50055", runtime_env=<your_runtime_env>)'  # noqa E501
          assert any(
              has_client_deprecation_warn(warning, expected)
              for warning in w
          )
  
          # Test warning works if both runtime env and namespace specified
          with warnings.catch_warnings(record=True) as w:
              try:
                  ray.client("localhost:50055").namespace("nmspc").env(
                      {"pip": ["requests"]}
                  ).connect()
              except ConnectionError:
                  pass
          expected = 'ray.init("ray://localhost:50055", namespace="nmspc", runtime_env=<your_runtime_env>)'  # noqa E501
          assert any(
              has_client_deprecation_warn(warning, expected)
              for warning in w
          )
  
          # We don't expect namespace to appear in the warning message, since
          # it was configured through an env var
          with warnings.catch_warnings(record=True) as w, patch.dict(
              os.environ, {"RAY_NAMESPACE": "abcdef"}
          ):
              try:
                  ray.client("localhost:50055").env(
                      {"pip": ["requests"]}
                  ).connect()
              except ConnectionError:
                  pass
          expected = 'ray.init("ray://localhost:50055", runtime_env=<your_runtime_env>)'  # noqa E501
          assert any(
              has_client_deprecation_warn(warning, expected)
              for warning in w
          )
  
      # cleanup
      server.stop(0)
      subprocess.check_output("ray stop --force", shell=True)
  
imports: import os
  import subprocess
  import sys
  import warnings
  from unittest.mock import Mock, patch
  import pytest
  import ray
  import ray.client_builder
  import ray.util.client.server.server
  from ray._private.test_utils import run_string_as_driver, run_string_as_driver_nonblocking, wait_for_condition, skip_flaky_core_test_premerge
  from ray.util.state import list_workers
label_desc: Use image node_id 12 for calling a global function with example usage: test_client_deprecation_warn() without return types