code: def dummy_input_layer(self):
      from lasagne.layers.input import InputLayer
  
      input_layer = InputLayer((2, 3, 4, 5))
      mock = Mock(input_layer)
      mock.shape = input_layer.shape
      mock.input_var = input_layer.input_var
      mock.output_shape = input_layer.output_shape
      return mock
  
imports: from mock import Mock
  import numpy
  import pytest
  import theano
  import lasagne
label_desc: Use image node_id 1 for calling the TestNINLayer obj's underlying member method code with example usage: obj.dummy_input_layer() and returns: mock