code: def test_DataSourceOpen(self):
      local_file = valid_textfile(self.tmpdir)
      # Test case where destpath is passed in
      fp = datasource.open(local_file, destpath=self.tmpdir)
      assert_(fp)
      fp.close()
      # Test case where default destpath is used
      fp = datasource.open(local_file)
      assert_(fp)
      fp.close()
  
imports: import os
  import pytest
  from tempfile import mkdtemp, mkstemp, NamedTemporaryFile
  from shutil import rmtree
  import numpy.lib._datasource
  from numpy.testing import assert_, assert_equal, assert_raises
  import urllib.request
  from urllib.parse import urlparse
  from urllib.error import URLError
label_desc: Use image node_id 3 for calling the TestOpenFunc obj's underlying member method code with example usage: obj.test_DataSourceOpen() without return types