code: def test_data(self):
      dat = self.img.get_fdata()
      assert dat.shape == self.img.shape
      frame = self.img.get_frame(0)
      assert_array_equal(frame, dat[:, :, :, 0])
  
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 3 for calling the TestEcatImage obj's underlying member method code with example usage: obj.test_data() without return types