code: def test_unknown_layer_name_exception(self):
      network = layers.join(
          layers.Input(10, name="input-1"),
          layers.Relu(5, name="relu-1"),
          layers.Relu(1, name="relu-2"),
      )
      with self.assertRaises(NameError):
          network.end("abc")
  
file_path: neupy/tests/layers/graph/test_slicing.py
imports: import numpy
  from neupy import layers
  from neupy.utils import asfloat
  from base import BaseTestCase
label_desc: Use image node_id 5 for calling the SliceLayerConnectionsTestCase obj's underlying member method code with example usage: obj.test_unknown_layer_name_exception() without return types