| Michael W. Hudson | f0d777c | 2002-07-19 15:47:06 +0000 | [diff] [blame] | 1 | # tests for slice objects; in particular the indices method. |
| 2 | |
| Raymond Hettinger | 5d2e777 | 2003-09-02 01:53:01 +0000 | [diff] [blame^] | 3 | import unittest |
| 4 | from test import test_support |
| 5 | |
| Michael W. Hudson | 173f11d | 2002-11-05 15:28:51 +0000 | [diff] [blame] | 6 | import sys |
| Michael W. Hudson | f0d777c | 2002-07-19 15:47:06 +0000 | [diff] [blame] | 7 | |
| Raymond Hettinger | 5d2e777 | 2003-09-02 01:53:01 +0000 | [diff] [blame^] | 8 | class SliceTest(unittest.TestCase): |
| Michael W. Hudson | 173f11d | 2002-11-05 15:28:51 +0000 | [diff] [blame] | 9 | |
| Raymond Hettinger | 5d2e777 | 2003-09-02 01:53:01 +0000 | [diff] [blame^] | 10 | def test_constructor(self): |
| 11 | self.assertRaises(TypeError, slice) |
| 12 | self.assertRaises(TypeError, slice, 1, 2, 3, 4) |
| 13 | |
| 14 | def test_repr(self): |
| 15 | self.assertEqual(repr(slice(1, 2, 3)), "slice(1, 2, 3)") |
| 16 | |
| 17 | def test_cmp(self): |
| 18 | s1 = slice(1, 2, 3) |
| 19 | s2 = slice(1, 2, 3) |
| 20 | s3 = slice(1, 2, 4) |
| 21 | self.assertEqual(s1, s2) |
| 22 | self.assertNotEqual(s1, s3) |
| 23 | |
| 24 | class Exc(Exception): |
| 25 | pass |
| 26 | |
| 27 | class BadCmp(object): |
| 28 | def __eq__(self, other): |
| 29 | raise Exc |
| 30 | |
| 31 | s1 = slice(BadCmp()) |
| 32 | s2 = slice(BadCmp()) |
| 33 | self.assertRaises(Exc, cmp, s1, s2) |
| 34 | self.assertEqual(s1, s1) |
| 35 | |
| 36 | s1 = slice(1, BadCmp()) |
| 37 | s2 = slice(1, BadCmp()) |
| 38 | self.assertEqual(s1, s1) |
| 39 | self.assertRaises(Exc, cmp, s1, s2) |
| 40 | |
| 41 | s1 = slice(1, 2, BadCmp()) |
| 42 | s2 = slice(1, 2, BadCmp()) |
| 43 | self.assertEqual(s1, s1) |
| 44 | self.assertRaises(Exc, cmp, s1, s2) |
| 45 | |
| 46 | def test_members(self): |
| 47 | s = slice(1) |
| 48 | self.assertEqual(s.start, None) |
| 49 | self.assertEqual(s.stop, 1) |
| 50 | self.assertEqual(s.step, None) |
| 51 | |
| 52 | s = slice(1, 2) |
| 53 | self.assertEqual(s.start, 1) |
| 54 | self.assertEqual(s.stop, 2) |
| 55 | self.assertEqual(s.step, None) |
| 56 | |
| 57 | s = slice(1, 2, 3) |
| 58 | self.assertEqual(s.start, 1) |
| 59 | self.assertEqual(s.stop, 2) |
| 60 | self.assertEqual(s.step, 3) |
| 61 | |
| 62 | class AnyClass: |
| 63 | pass |
| 64 | |
| 65 | obj = AnyClass() |
| 66 | s = slice(obj) |
| 67 | self.assert_(s.stop is obj) |
| 68 | |
| 69 | def test_indices(self): |
| 70 | self.assertEqual(slice(None ).indices(10), (0, 10, 1)) |
| 71 | self.assertEqual(slice(None, None, 2).indices(10), (0, 10, 2)) |
| 72 | self.assertEqual(slice(1, None, 2).indices(10), (1, 10, 2)) |
| 73 | self.assertEqual(slice(None, None, -1).indices(10), (9, -1, -1)) |
| 74 | self.assertEqual(slice(None, None, -2).indices(10), (9, -1, -2)) |
| 75 | self.assertEqual(slice(3, None, -2).indices(10), (3, -1, -2)) |
| 76 | self.assertEqual( |
| 77 | slice(-100, 100 ).indices(10), |
| 78 | slice(None).indices(10) |
| 79 | ) |
| 80 | self.assertEqual( |
| 81 | slice(100, -100, -1).indices(10), |
| 82 | slice(None, None, -1).indices(10) |
| 83 | ) |
| 84 | self.assertEqual(slice(-100L, 100L, 2L).indices(10), (0, 10, 2)) |
| 85 | |
| 86 | self.assertEqual(range(10)[::sys.maxint - 1], [0]) |
| 87 | |
| 88 | self.assertRaises(OverflowError, slice(None).indices, 1L<<100) |
| 89 | |
| 90 | def test_main(): |
| 91 | test_support.run_unittest(SliceTest) |
| 92 | |
| 93 | if __name__ == "__main__": |
| 94 | test_main() |