code: def test_from_euler_single_rotation():
      quat = Rotation.from_euler("z", 90, degrees=True).as_quat()
      expected_quat = np.array([0, 0, 1, 1]) / np.sqrt(2)
      assert_allclose(quat, expected_quat)
  
imports: from __future__ import division, print_function, absolute_import
  import pytest
  import numpy
  from numpy.testing import assert_equal, assert_array_almost_equal
  from numpy.testing import assert_allclose
  from scipy.spatial.transform import Rotation, Slerp
  from scipy.stats import special_ortho_group
  from itertools import permutations
label_desc: Use image node_id 27 for calling a global function with example usage: test_from_euler_single_rotation() without return types