code: def test_get_output_shape_for(self, axis):
      layer = self.layer(axis)
      assert layer.get_output_shape_for([(3, 2), (3, 5)]) == (3, 7)
      assert layer.get_output_shape_for([(3, 2), (3, None)]) == (
          3,
          None,
      )
      assert layer.get_output_shape_for([(None, 2), (3, 5)]) == (3, 7)
      assert layer.get_output_shape_for([(None, 2), (None, 5)]) == (
          None,
          7,
      )
      with pytest.raises(ValueError):
          layer.get_output_shape_for([(4, None), (3, 5)])
      with pytest.raises(ValueError):
          layer.get_output_shape_for([(3, 2), (4, None)])
      with pytest.raises(ValueError):
          layer.get_output_shape_for([(None, 2), (3, 5), (4, 5)])
  
imports: from mock import Mock
  import numpy
  import pytest
  import theano
label_desc: Use image node_id 4 for calling the TestConcatLayer obj's underlying member method code with example usage: obj.test_get_output_shape_for(axis) without return types