code: def test_make_file_iso88591_charset(self):
      html_diff = difflib.HtmlDiff()
      output = html_diff.make_file(
          patch914575_from1.splitlines(),
          patch914575_to1.splitlines(),
          charset="iso-8859-1",
      )
      self.assertIn('content="text/html; charset=iso-8859-1"', output)
  
imports: import difflib
  from test.support import findfile
  import unittest
  import doctest
  import sys
label_desc: Use image node_id 4 for calling the TestSFpatches obj's underlying member method code with example usage: obj.test_make_file_iso88591_charset() without return types