code: def test_get_output_shape_for_contain_none(self, layer):
      input_shape = (2, 3, None, 5)
      assert layer.get_output_shape_for(input_shape) == (2, None)
  
imports: import numpy
  import pytest
  import theano
  from mock import Mock
label_desc: Use image node_id 5 for calling the TestFlattenLayer obj's underlying member method code with example usage: obj.test_get_output_shape_for_contain_none(layer) without return types