code: def test_none_shape(self, func, input_layer, ExpressionLayer):
      from lasagne.layers.helper import get_output
  
      X, expected = self.np_result(func, input_layer)
  
      layer = ExpressionLayer(input_layer, func, output_shape=None)
      if X.shape == expected.shape:
          assert layer.get_output_shape_for(X.shape) == expected.shape
  
      output = get_output(layer, X).eval()
      assert np.allclose(output, expected)
  
imports: from mock import Mock
  import numpy
  import pytest
  import theano
  from lasagne.layers import InputLayer, standardize, get_output, get_all_params
  from lasagne.utils import floatX
label_desc: Use image node_id 7 for calling the TestExpressionLayer obj's underlying member method code with example usage: obj.test_none_shape(func, input_layer, ExpressionLayer) without return types