code: def test_save(self):
      tmp_file = "tinypet_tmp.v"
      with InTemporaryDirectory():
          self.img.to_filename(tmp_file)
          other = self.image_class.load(tmp_file)
          assert_array_equal(self.img.get_fdata(), other.get_fdata())
          # Delete object holding reference to temporary file to make Windows
          # happier.
          del other
  
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 2 for calling the TestEcatImage obj's underlying member method code with example usage: obj.test_save() without return types