code: def np_result(self, func, input_layer):
      X = np.random.uniform(-1, 1, input_layer.output_shape)
      return X, func(X)
  
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 4 for calling the TestExpressionLayer obj's underlying member method code with example usage: obj.np_result(func, input_layer) and returns: X,  func