code: def test_to_string_on_json_get():
      func = JsonGet(
          step_name="my-step",
          property_file="my-property-file",
          json_path="my-json-path",
      )
  
      assert func.to_string().expr == {
          "Std:Join": {
              "On": "",
              "Values": [
                  {
                      "Std:JsonGet": {
                          "Path": "my-json-path",
                          "PropertyFile": {
                              "Get": "Steps.my-step.PropertyFiles.my-property-file"
                          },
                      }
                  }
              ],
          },
      }
  
file_path: sagemaker-python-sdk/tests/unit/sagemaker/workflow/test_functions.py
imports: from __future__ import absolute_import
  import pytest
  from sagemaker.workflow.execution_variables import ExecutionVariables
  from sagemaker.workflow.functions import Join, JsonGet
  from sagemaker.workflow.parameters import ParameterFloat, ParameterInteger, ParameterString
  from sagemaker.workflow.properties import Properties, PropertyFile
label_desc: Use image node_id 10 for calling a global function with example usage: test_to_string_on_json_get() without return types