code: def test_essential_matrix_init():
      tform = EssentialMatrixTransform(
          rotation=np.eye(3), translation=np.array([0, 0, 1])
      )
      assert_equal(
          tform.params,
          np.array([0, -1, 0, 1, 0, 0, 0, 0, 0]).reshape(3, 3),
      )
  
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 19 for calling a global function with example usage: test_essential_matrix_init() without return types