code: def test_get_output_for(self, layer):
      input = np.random.random((2, 3, 4, 5))
      result = layer.get_output_for(theano.shared(input)).eval()
      assert (result == input.reshape((input.shape[0], -1))).all()
  
imports: import numpy
  import pytest
  import theano
  from mock import Mock
label_desc: Use image node_id 6 for calling the TestFlattenLayer obj's underlying member method code with example usage: obj.test_get_output_for(layer) without return types