class_docstr: The purpose of these tests is to ensure the difflib wrappers works.
  
  It is not the goal of these tests to exhaustively test difflib functionality.
class_docstr_tok: ["The","purpose","of","these","tests","is","to","ensure","the","difflib","wrappers","works",".","It","is","not","the","goal","of","these","tests","to","exhaustively","test","difflib","functionality","."]
code: def testUnifiedDiff(self):
      results = list(self.diff.unified_diff())
      self.assertTrue(results[0].startswith("--- " + self.file1.name))
      self.assertTrue(results[1].startswith("+++ " + self.file2.name))
      self.assertEqual(
          results[2:],
          [
              "@@ -1,2 +1,3 @@\n",
              " test\n",
              "-test1\n",
              "+test2\n",
              "+extraline\n",
          ],
      )
  
file_path: python-fire/examples/diff/diff_test.py
imports: import tempfile
  from fire import testutils
  from examples.diff import diff
  from examples.diff import difffull
label_desc: Use image node_id 3 for calling the DiffTest obj's underlying member method code with example usage: obj.testUnifiedDiff() without return types