code: def test_init_none_nonlinearity_bias(
      self, DenseLayer, dummy_input_layer
  ):
      layer = DenseLayer(
          dummy_input_layer,
          num_units=3,
          nonlinearity=None,
          b=None,
      )
      assert layer.nonlinearity == lasagne.nonlinearities.identity
      assert layer.b is None
  
imports: from mock import Mock
  import numpy
  import pytest
  import theano
  import lasagne
label_desc: Use image node_id 5 for calling the TestDenseLayer obj's underlying member method code with example usage: obj.test_init_none_nonlinearity_bias(DenseLayer, dummy_input_layer) without return types