code: def test_vector_rotation():
      """Test basic rotation matrix math."""
      x = np.array([1.0, 0.0, 0.0])
      y = np.array([0.0, 1.0, 0.0])
      rot = _find_vector_rotation(x, y)
      assert_array_equal(rot, [[0, -1, 0], [1, 0, 0], [0, 0, 1]])
      quat_1 = rot_to_quat(rot)
      quat_2 = rot_to_quat(np.eye(3))
      assert_allclose(_angle_between_quats(quat_1, quat_2), np.pi / 2.0)
  
imports: import itertools
  import os
  from pathlib import Path
  import numpy
  import pytest
  from numpy.testing import assert_allclose, assert_almost_equal, assert_array_equal, assert_array_less, assert_equal
  import mne
  from mne import read_trans, write_trans
  from mne.datasets import testing
  from mne.fixes import _get_img_fdata
  from mne.io import read_info
  from mne.transforms import _angle_between_quats, _average_quats, _cart_to_sph, _compute_r2, _euler_to_quat, _find_trans, _find_vector_rotation, _fit_matched_points, _get_trans, _MatchedDisplacementFieldInterpolator, _pol_to_cart, _quat_real, _quat_to_affine, _quat_to_euler, _read_fs_xfm, _sph_to_cart, _topo_to_sph, _validate_pipeline, _write_fs_xfm, apply_trans, combine_transforms, get_ras_to_neuromag_trans, invert_transform, quat_to_rot, rot_to_quat, rotation, rotation3d, rotation3d_align_z_axis, rotation_angles, translation
  from mne.transforms import _SphericalSurfaceWarp
label_desc: Use image node_id 16 for calling a global function with example usage: test_vector_rotation() without return types