code: def test_quaternion_reconstruction(q):
      # Test reconstruction of arbitrary unit quaternions
      M = nq.quat2mat(q)
      qt = nq.mat2quat(M)
      # Accept positive or negative match
      posm = np.allclose(q, qt)
      negm = np.allclose(q, -qt)
      assert posm or negm
  
imports: import numpy
  import pytest
  from numpy import pi
  from numpy.testing import assert_array_almost_equal, assert_array_equal
  from ..None import eulerangles
  from ..None import quaternions
label_desc: Use image node_id 16 for calling a global function with example usage: test_quaternion_reconstruction(q) without return types