code: def test_get_output_shape_for(self, layer):
      input_shape = (2, 3, 4, 5)
      assert layer.get_output_shape_for(input_shape) == (2, 3 * 4 * 5)
  
imports: import numpy
  import pytest
  import theano
  from mock import Mock
label_desc: Use image node_id 4 for calling the TestFlattenLayer obj's underlying member method code with example usage: obj.test_get_output_shape_for(layer) without return types