code: def test_add_invalid_edge():
      _test_add_invalid_edge("in")
      _test_add_invalid_edge("out")
  
file_path: OMLT/tests/neuralnet/test_network_definition.py
imports: import numpy
  import pyomo.environ
  import pytest
  from omlt.block import OmltBlock
  from omlt.neuralnet.layer import DenseLayer, InputLayer
  from omlt.neuralnet.network_definition import NetworkDefinition
  from omlt.neuralnet.nn_formulation import FullSpaceNNFormulation
  from omlt.scaling import OffsetScaling
label_desc: Use image node_id 6 for calling a global function with example usage: test_add_invalid_edge() without return types