"""Unit tests for buffer objects.

For now, tests just new or changed functionality.

"""

import unittest
from test import test_support

class BufferTests(unittest.TestCase):

 def test_extended_getslice(self):
 # Test extended slicing by comparing with list slicing.
 s = "".join(chr(c) for c in list(range(255, -1, -1)))
 b = buffer(s)
 indices = (0, None, 1, 3, 19, 300, -1, -2, -31, -300)
 for start in indices:
 for stop in indices:
 # Skip step 0 (invalid)
 for step in indices[1:]:
 self.assertEqual(b[start:stop:step],
 s[start:stop:step])


def test_main():
 test_support.run_unittest(BufferTests)

if __name__ == "__main__":
 test_main()