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//usr/lib/python2.4/test/test_slice.py
# tests for slice objects; in particular the indices method. import unittest from test import test_support import sys class SliceTest(unittest.TestCase): def test_constructor(self): self.assertRaises(TypeError, slice) self.assertRaises(TypeError, slice, 1, 2, 3, 4) def test_repr(self): self.assertEqual(repr(slice(1, 2, 3)), "slice(1, 2, 3)") def test_hash(self): # Verify clearing of SF bug #800796 self.assertRaises(TypeError, hash, slice(5)) self.assertRaises(TypeError, slice(5).__hash__) def test_cmp(self): s1 = slice(1, 2, 3) s2 = slice(1, 2, 3) s3 = slice(1, 2, 4) self.assertEqual(s1, s2) self.assertNotEqual(s1, s3) class Exc(Exception): pass class BadCmp(object): def __eq__(self, other): raise Exc s1 = slice(BadCmp()) s2 = slice(BadCmp()) self.assertRaises(Exc, cmp, s1, s2) self.assertEqual(s1, s1) s1 = slice(1, BadCmp()) s2 = slice(1, BadCmp()) self.assertEqual(s1, s1) self.assertRaises(Exc, cmp, s1, s2) s1 = slice(1, 2, BadCmp()) s2 = slice(1, 2, BadCmp()) self.assertEqual(s1, s1) self.assertRaises(Exc, cmp, s1, s2) def test_members(self): s = slice(1) self.assertEqual(s.start, None) self.assertEqual(s.stop, 1) self.assertEqual(s.step, None) s = slice(1, 2) self.assertEqual(s.start, 1) self.assertEqual(s.stop, 2) self.assertEqual(s.step, None) s = slice(1, 2, 3) self.assertEqual(s.start, 1) self.assertEqual(s.stop, 2) self.assertEqual(s.step, 3) class AnyClass: pass obj = AnyClass() s = slice(obj) self.assert_(s.stop is obj) def test_indices(self): self.assertEqual(slice(None ).indices(10), (0, 10, 1)) self.assertEqual(slice(None, None, 2).indices(10), (0, 10, 2)) self.assertEqual(slice(1, None, 2).indices(10), (1, 10, 2)) self.assertEqual(slice(None, None, -1).indices(10), (9, -1, -1)) self.assertEqual(slice(None, None, -2).indices(10), (9, -1, -2)) self.assertEqual(slice(3, None, -2).indices(10), (3, -1, -2)) self.assertEqual( slice(-100, 100 ).indices(10), slice(None).indices(10) ) self.assertEqual( slice(100, -100, -1).indices(10), slice(None, None, -1).indices(10) ) self.assertEqual(slice(-100L, 100L, 2L).indices(10), (0, 10, 2)) self.assertEqual(range(10)[::sys.maxint - 1], [0]) self.assertRaises(OverflowError, slice(None).indices, 1L<<100) def test_main(): test_support.run_unittest(SliceTest) if __name__ == "__main__": test_main()