old_contents: import unittest
  from test import test_support
  
  import cStringIO
  import ast
  import _ast
  import unparse
  
  forelse = """\
  def f():
      for x in range(10):
          break
      else:
          y = 2
      z = 3
  """
  
  whileelse = """\
  def g():
      while True:
          break
      else:
          y = 2
      z = 3
  """
  
  class UnparseTestCase(unittest.TestCase):
      # Tests for specific bugs found in earlier versions of unparse
  
      def check_roundtrip(self, code1, filename="internal"):
          ast1 = compile(code1, filename, "exec", _ast.PyCF_ONLY_AST)
          unparse_buffer = cStringIO.StringIO()
          unparse.Unparser(ast1, unparse_buffer)
          code2 = unparse_buffer.getvalue()
          ast2 = compile(code2, filename, "exec", _ast.PyCF_ONLY_AST)
          self.assertEqual(ast.dump(ast1), ast.dump(ast2))
  
      def test_del_statement(self):
          self.check_roundtrip("del x, y, z")
  
      def test_shifts(self):
          self.check_roundtrip("45 << 2")
          self.check_roundtrip("13 >> 7")
  
      def test_for_else(self):
          self.check_roundtrip(forelse)
  
      def test_while_else(self):
          self.check_roundtrip(forelse)
  
      def test_unary_parens(self):
          self.check_roundtrip("(-1)**7")
          self.check_roundtrip("not True or False")
          self.check_roundtrip("True or not False")
  
  
  def test_main():
      test_support.run_unittest(UnparseTestCase)
  
  if __name__ == '__main__':
      test_main()
  
new_contents: import unittest
  from test import test_support
  
  import cStringIO
  import ast
  import _ast
  import unparse
  
  forelse = """\
  def f():
      for x in range(10):
          break
      else:
          y = 2
      z = 3
  """
  
  whileelse = """\
  def g():
      while True:
          break
      else:
          y = 2
      z = 3
  """
  
  class UnparseTestCase(unittest.TestCase):
      # Tests for specific bugs found in earlier versions of unparse
  
      def check_roundtrip(self, code1, filename="internal"):
          ast1 = compile(code1, filename, "exec", _ast.PyCF_ONLY_AST)
          unparse_buffer = cStringIO.StringIO()
          unparse.Unparser(ast1, unparse_buffer)
          code2 = unparse_buffer.getvalue()
          ast2 = compile(code2, filename, "exec", _ast.PyCF_ONLY_AST)
          self.assertEqual(ast.dump(ast1), ast.dump(ast2))
  
      def test_del_statement(self):
          self.check_roundtrip("del x, y, z")
  
      def test_shifts(self):
          self.check_roundtrip("45 << 2")
          self.check_roundtrip("13 >> 7")
  
      def test_for_else(self):
          self.check_roundtrip(forelse)
  
      def test_while_else(self):
          self.check_roundtrip(whileelse)
  
      def test_unary_parens(self):
          self.check_roundtrip("(-1)**7")
          self.check_roundtrip("not True or False")
          self.check_roundtrip("True or not False")
  
  
  def test_main():
      test_support.run_unittest(UnparseTestCase)
  
  if __name__ == '__main__':
      test_main()
  
subject: Fix typo in test_unparse.py.