code: def test_euler_mat_1():
      M = nea.euler2mat()
      assert_array_equal(M, np.eye(3))
  
file_path: nibabel/nibabel/tests/test_euler.py
imports: import math
  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 7 for calling a global function with example usage: test_euler_mat_1() without return types