code: def test_merge_two_unknowns(self, layerclass, two_unknown):
      inputlayer, inputdata = two_unknown
      layer = layerclass(inputlayer, ([0], [1], -1, [4]))
      assert layer.output_shape == (16, 3, None, 10)
      result = layer.get_output_for(inputdata).eval()
      assert result.shape == (16, 3, 35, 10)
  
imports: import numpy
  import pytest
  import theano
  from mock import Mock
label_desc: Use image node_id 8 for calling the TestReshapeLayer obj's underlying member method code with example usage: obj.test_merge_two_unknowns(layerclass, two_unknown) without return types