code: def test_pad(self, DummyInputLayer):
      try:
          from lasagne.layers.cuda_convnet import Conv2DCCLayer
      except ImportError:
          pytest.skip("cuda_convnet not available")
  
      input_layer = DummyInputLayer((128, 3, 32, 32))
      layer = Conv2DCCLayer(
          input_layer, num_filters=16, filter_size=(3, 3), pad=(3, 3)
      )
      assert layer.output_shape == (128, 16, 36, 36)
  
imports: import numpy
  import pytest
  import importlib
  import theano
  from theano import tensor
  import lasagne
  from lasagne.utils import floatX, as_tuple
label_desc: Use image node_id 3 for calling the TestConv2DCCLayer obj's underlying member method code with example usage: obj.test_pad(DummyInputLayer) without return types