code: def test_union_differing_types():
      tform1 = SimilarityTransform()
      tform2 = PolynomialTransform()
      with pytest.raises(TypeError):
          tform1.__add__(tform2)
  
imports: import re
  import textwrap
  import numpy
  import pytest
  from numpy.testing import assert_almost_equal, assert_array_almost_equal, assert_equal
  from skimage.transform import AffineTransform, EssentialMatrixTransform, EuclideanTransform, FundamentalMatrixTransform, PiecewiseAffineTransform, PolynomialTransform, ProjectiveTransform, SimilarityTransform, estimate_transform, matrix_transform
  from skimage.transform._geometric import _GeometricTransform, _affine_matrix_from_vector, _center_and_normalize_points, _euler_rotation_matrix
label_desc: Use image node_id 33 for calling a global function with example usage: test_union_differing_types() without return types