code: def execute(self, ctx):
      if not self.success:
          raise Exception("MockOperator failed")
  
      if self.sets_progress:
          ctx.set_progress(0.5, "halfway there")
      return ExecutionResult(result={"executed": True})
  
imports: import time
  import unittest
  from unittest import mock
  from unittest.mock import patch
  import pytest
  import fiftyone
  from bson import ObjectId
  from fiftyone import Dataset
  from fiftyone.factory import DelegatedOperationPagingParams, SortDirection, SortByField
  from fiftyone.operators.delegated import DelegatedOperationService
  from fiftyone.operators.executor import ExecutionContext, ExecutionResult, ExecutionRunState, ExecutionProgress
  from fiftyone.operators.operator import Operator, OperatorConfig
label_desc: Use image node_id 5 for calling the MockOperator obj's underlying member method code with example usage: obj.execute(ctx) and returns: ExecutionResult