code: def test_mlist_regression(self):
      # Test mlist is as same as for nibabel 1.3.0
      assert_array_equal(self.img.get_mlist(), [[16842758, 3, 3011, 1]])
  
imports: import os
  import warnings
  from pathlib import Path
  from unittest import TestCase
  import numpy
  import pytest
  from numpy.testing import assert_array_almost_equal, assert_array_equal
  from ..ecat import EcatHeader, EcatImage, EcatSubHeader, get_frame_order, get_series_framenumbers, read_mlist
  from ..openers import Opener
  from ..testing import data_path, suppress_warnings
  from ..tmpdirs import InTemporaryDirectory
  from .None import test_wrapstruct
  from .test_fileslice import slicer_samples
label_desc: Use image node_id 9 for calling the TestEcatImage obj's underlying member method code with example usage: obj.test_mlist_regression() without return types