code: def test_from_single_1d_quaternion():
      x = np.array([3, 4, 0, 0])
      r = Rotation.from_quat(x)
      expected_quat = x / 5
      assert_array_almost_equal(r.as_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 2 for calling a global function with example usage: test_from_single_1d_quaternion() without return types