code: def test_add_func_of_join():
      func_join1 = Join(values=[1, "a"])
      param = ParameterInteger(name="MyInteger", default_value=3)
  
      with pytest.raises(TypeError) as error:
          func_join1 + param
  
      assert (
          str(error.value)
          == "Pipeline variables do not support concatenation."
      )
  
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 6 for calling a global function with example usage: test_add_func_of_join() without return types