code: def test_ValidFile(self):
      # Test valid file in destpath
      tmpfile = valid_textfile(self.tmpdir)
      assert_(self.ds.exists(tmpfile))
      # Test valid local file not in destpath
      localdir = mkdtemp()
      tmpfile = valid_textfile(localdir)
      assert_(self.ds.exists(tmpfile))
      rmtree(localdir)
  
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 5 for calling the TestDataSourceExists obj's underlying member method code with example usage: obj.test_ValidFile() without return types