code: def test_appendable_environ(ray_start_regular):
      @ray.remote
      def get_env(key):
          return os.environ.get(key)
  
      custom_env = os.path.pathsep + "/usr/local/bin"
      remote_env = ray.get(
          get_env.options(
              runtime_env={
                  "env_vars": {
                      "PATH": "${PATH}" + custom_env,
                  }
              }
          ).remote("PATH")
      )
      assert remote_env.endswith(custom_env)
      assert len(remote_env) > len(custom_env)
  
file_path: ray/python/ray/tests/test_runtime_env_env_vars.py
imports: import os
  import sys
  import pytest
  import ray
label_desc: Use image node_id 8 for calling a global function with example usage: test_appendable_environ(ray_start_regular) and returns: os