text: """Test compiler changes for unary ops (+, -, ~) introduced in Python 2.2"""
  
  import unittest
  
  class UnaryOpTestCase(unittest.TestCase):
  
      def test_negative(self):
          self.assertTrue(-2 == 0 - 2)
          self.assertEqual(-0, 0)
          self.assertEqual(--2, 2)
          self.assertTrue(-2 == 0 - 2)
          self.assertTrue(-2.0 == 0 - 2.0)
          self.assertTrue(-2j == 0 - 2j)
  
      def test_positive(self):
          self.assertEqual(+2, 2)
          self.assertEqual(+0, 0)
          self.assertEqual(++2, 2)
          self.assertEqual(+2, 2)
          self.assertEqual(+2.0, 2.0)
          self.assertEqual(+2j, 2j)
  
      def test_invert(self):
          self.assertTrue(-2 == 0 - 2)
          self.assertEqual(-0, 0)
          self.assertEqual(--2, 2)
          self.assertTrue(-2 == 0 - 2)
  
      def test_no_overflow(self):
          nines = "9" * 32
          self.assertTrue(eval("+" + nines) == 10**32-1)
          self.assertTrue(eval("-" + nines) == -(10**32-1))
          self.assertTrue(eval("~" + nines) == ~(10**32-1))
  
      def test_negation_of_exponentiation(self):
          # Make sure '**' does the right thing; these form a
          # regression test for SourceForge bug #456756.
          self.assertEqual(-2 ** 3, -8)
          self.assertEqual((-2) ** 3, -8)
          self.assertEqual(-2 ** 4, -16)
          self.assertEqual((-2) ** 4, 16)
  
      def test_bad_types(self):
          for op in '+', '-', '~':
              self.assertRaises(TypeError, eval, op + "b'a'")
              self.assertRaises(TypeError, eval, op + "'a'")
  
          self.assertRaises(TypeError, eval, "~2j")
          self.assertRaises(TypeError, eval, "~2.0")
  
  
  if __name__ == "__main__":
      unittest.main()
  