new_contents: import numpy as np
  import numpy.testing as npt
  
  import AFQ.data as afd
  from AFQ.utils.conversion import matlab_tractography, matlab_mori_groups
  
  import os
  
  def test_matlab_tractography():
      sft = matlab_tractography(
          "AFQ/tests/data/WholeBrainFG_test.mat",
          afd.read_mni_template())
      npt.assert_equal(len(sft.streamlines), 2)
  
  def test_matlab_mori_groups():
      fiber_groups = matlab_mori_groups(
          "AFQ/tests/data/MoriGroups_Test.mat",
          afd.read_mni_template())
      npt.assert_equal(len(fiber_groups.keys()), 20)
      npt.assert_equal(len(fiber_groups['CST_R'].streamlines), 2)
  
subject: add test file