code: def test_delete_1(workflow_start_regular):
      with pytest.raises(WorkflowNotFoundError):
          workflow.delete(workflow_id="never_existed")
  
      @ray.remote
      def hello():
          return "hello world"
  
      workflow.run(hello.bind(), workflow_id="workflow_exists")
      workflow.delete(workflow_id="workflow_exists")
  
file_path: ray/python/ray/workflow/tests/test_storage.py
imports: import subprocess
  import time
  import pytest
  import ray
  from ray import workflow
  from ray._private import signature
  from ray.tests.conftest import *
  from ray.workflow import workflow_storage
  from ray.workflow.common import TaskType, WorkflowTaskRuntimeOptions
  from ray.workflow.exceptions import WorkflowNotFoundError
  from ray.workflow import serialization_context
  from ray.workflow.tests import utils
label_desc: Use image node_id 3 for calling a global function with example usage: test_delete_1(workflow_start_regular) and returns: str