code: def test_node_get_output():
      mod1 = pe.Node(interface=EngineTestInterface(), name="mod1")
      mod1.inputs.input1 = 1
      mod1.run()
      assert mod1.get_output("output1") == [1, 1]
      mod1._result = None
      assert mod1.get_output("output1") == [1, 1]
  
imports: import os
  from copy import deepcopy
  import pytest
  from ....None import config
  from ....interfaces import utility
  from ....interfaces import base
  from ...None import engine
  from ..utils import merge_dict
  from .test_base import EngineTestInterface
  from .test_utils import UtilsTestInterface
label_desc: Use image node_id 2 for calling a global function with example usage: test_node_get_output() without return types