code: def test_mu2tet():
      # 15 digit precision error found on 32-bit Linux
      # https://travis-ci.org/MacPython/nipy-wheels/jobs/140268248#L725
      assert_almost_equal(
          intvol.mu2_tet(0, 0, 0, 0, 1, 0, 0, 1, 0, 1),
          (3.0 / 2 + np.sqrt(3.0 / 4)) / 2,
          15,
      )
  
imports: from itertools import combinations
  import numpy
  import numpy.linalg
  import pytest
  from numpy.testing import assert_almost_equal, assert_array_equal
  from ..None import intvol
label_desc: Use image node_id 13 for calling a global function with example usage: test_mu2tet() without return types