new_contents: """Test compiler changes for unary ops (+, -, ~) introduced in Python 2.2"""
  
  import unittest
  from test_support import run_unittest
  
  class UnaryOpTestCase(unittest.TestCase):
  
      def test_negative(self):
          self.assert_(-2 == 0 - 2)
          self.assert_(-0 == 0)
          self.assert_(--2 == 2)
          self.assert_(-2L == 0 - 2L)
          self.assert_(-2.0 == 0 - 2.0)
          self.assert_(-2j == 0 - 2j)
  
      def test_positive(self):
          self.assert_(+2 == 2)
          self.assert_(+0 == 0)
          self.assert_(++2 == 2)
          self.assert_(+2L == 2L)
          self.assert_(+2.0 == 2.0)
          self.assert_(+2j == 2j)
  
      def test_invert(self):
          self.assert_(-2 == 0 - 2)
          self.assert_(-0 == 0)
          self.assert_(--2 == 2)
          self.assert_(-2L == 0 - 2L)
  
      def test_overflow(self):
          self.assertRaises(OverflowError, eval, "+" + ("9" * 32))
          self.assertRaises(OverflowError, eval, "-" + ("9" * 32))
          self.assertRaises(OverflowError, eval, "~" + ("9" * 32))
  
      def test_bad_types(self):
          for op in '+', '-', '~':
              self.assertRaises(TypeError, eval, op + "'a'")
              self.assertRaises(TypeError, eval, op + "u'a'")
  
          self.assertRaises(TypeError, eval, "~2j")
          self.assertRaises(TypeError, eval, "~2.0")
  
  run_unittest(UnaryOpTestCase)
  
subject: Test the unary operator changes to the compiler