code: def test_step_decorator_with_default_step_configs(mock_job_settings):
      @step
      def sum(a, b, c, d):
          """Returns sum of numbers"""
          return a + b + c + d
  
      step_output = sum(2, 3, c=3, d=5)
  
      assert isinstance(step_output, DelayedReturn)
  
      function_step = get_step(step_output)
  
      assert function_step is not None
      assert "sum" in function_step.name
      assert (
          function_step.display_name
          == "tests.unit.sagemaker.workflow.test_function_step.sum"
      )
      assert function_step.description == "Returns sum of numbers"
      assert function_step.retry_policies == []
      assert function_step.depends_on == []
      assert function_step._serialized_data.func is not None
      assert function_step._serialized_data.args is not None
  
imports: from __future__ import absolute_import
  from copy import deepcopy
  import pytest
  import re
  from mock import patch, Mock, ANY
  from typing import List, Tuple
  from mock.mock import MagicMock
  from sagemaker.workflow.parameters import ParameterInteger
  from sagemaker.workflow.execution_variables import ExecutionVariables
  from sagemaker.workflow.functions import Join
  from sagemaker.workflow.step_outputs import get_step
  from sagemaker.workflow.function_step import DelayedReturn, step
  from sagemaker.workflow.retry import StepRetryPolicy, StepExceptionTypeEnum
  from sagemaker.workflow.pipeline_context import _PipelineConfig
  from sagemaker.workflow.pipeline_definition_config import PipelineDefinitionConfig
label_desc: Use image node_id 2 for calling a global function with example usage: test_step_decorator_with_default_step_configs(mock_job_settings) and returns: unknown