code: def test_in_virtualenv(start_cluster):
      assert (
          PipProcessor._is_in_virtualenv() is False
          and "IN_VIRTUALENV" not in os.environ
      ) or (
          PipProcessor._is_in_virtualenv() is True
          and "IN_VIRTUALENV" in os.environ
      )
      cluster, address = start_cluster
      runtime_env = {"pip": ["pip-install-test==0.5"]}
  
      ray.init(address, runtime_env=runtime_env)
  
      @ray.remote
      def f():
          import pip_install_test  # noqa: F401
  
          return PipProcessor._is_in_virtualenv()
  
      # Ensure that the runtime env has been installed
      # and virtualenv is activated.
      assert ray.get(f.remote())
  
file_path: ray/python/ray/tests/test_runtime_env_conda_and_pip_4.py
imports: import os
  import pytest
  import sys
  from ray._private.runtime_env.pip import PipProcessor
  import ray
label_desc: Use image node_id 1 for calling a global function with example usage: test_in_virtualenv(start_cluster) and returns: PipProcessor