/Lib/test/test_unary.py

http://unladen-swallow.googlecode.com/ · Python · 59 lines · 43 code · 13 blank · 3 comment · 3 complexity · d221e17c2a986654a059dccbb871b7b6 MD5 · raw file

  1. """Test compiler changes for unary ops (+, -, ~) introduced in Python 2.2"""
  2. import unittest
  3. from test.test_support import run_unittest, have_unicode
  4. class UnaryOpTestCase(unittest.TestCase):
  5. def test_negative(self):
  6. self.assert_(-2 == 0 - 2)
  7. self.assert_(-0 == 0)
  8. self.assert_(--2 == 2)
  9. self.assert_(-2L == 0 - 2L)
  10. self.assert_(-2.0 == 0 - 2.0)
  11. self.assert_(-2j == 0 - 2j)
  12. def test_positive(self):
  13. self.assert_(+2 == 2)
  14. self.assert_(+0 == 0)
  15. self.assert_(++2 == 2)
  16. self.assert_(+2L == 2L)
  17. self.assert_(+2.0 == 2.0)
  18. self.assert_(+2j == 2j)
  19. def test_invert(self):
  20. self.assert_(-2 == 0 - 2)
  21. self.assert_(-0 == 0)
  22. self.assert_(--2 == 2)
  23. self.assert_(-2L == 0 - 2L)
  24. def test_no_overflow(self):
  25. nines = "9" * 32
  26. self.assert_(eval("+" + nines) == eval("+" + nines + "L"))
  27. self.assert_(eval("-" + nines) == eval("-" + nines + "L"))
  28. self.assert_(eval("~" + nines) == eval("~" + nines + "L"))
  29. def test_negation_of_exponentiation(self):
  30. # Make sure '**' does the right thing; these form a
  31. # regression test for SourceForge bug #456756.
  32. self.assertEqual(-2 ** 3, -8)
  33. self.assertEqual((-2) ** 3, -8)
  34. self.assertEqual(-2 ** 4, -16)
  35. self.assertEqual((-2) ** 4, 16)
  36. def test_bad_types(self):
  37. for op in '+', '-', '~':
  38. self.assertRaises(TypeError, eval, op + "'a'")
  39. if have_unicode:
  40. self.assertRaises(TypeError, eval, op + "u'a'")
  41. self.assertRaises(TypeError, eval, "~2j")
  42. self.assertRaises(TypeError, eval, "~2.0")
  43. def test_main():
  44. run_unittest(UnaryOpTestCase)
  45. if __name__ == "__main__":
  46. test_main()