| # tests for slice objects; in particular the indices method. |
| |
| import unittest |
| from test import test_support |
| from cPickle import loads, dumps |
| |
| 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 |
| __hash__ = None # Silence Py3k warning |
| |
| 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.assertTrue(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)) |
| # issue 3004 tests |
| self.assertEqual(slice(None, -9).indices(10), (0, 1, 1)) |
| self.assertEqual(slice(None, -10).indices(10), (0, 0, 1)) |
| self.assertEqual(slice(None, -11).indices(10), (0, 0, 1)) |
| self.assertEqual(slice(None, -10, -1).indices(10), (9, 0, -1)) |
| self.assertEqual(slice(None, -11, -1).indices(10), (9, -1, -1)) |
| self.assertEqual(slice(None, -12, -1).indices(10), (9, -1, -1)) |
| self.assertEqual(slice(None, 9).indices(10), (0, 9, 1)) |
| self.assertEqual(slice(None, 10).indices(10), (0, 10, 1)) |
| self.assertEqual(slice(None, 11).indices(10), (0, 10, 1)) |
| self.assertEqual(slice(None, 8, -1).indices(10), (9, 8, -1)) |
| self.assertEqual(slice(None, 9, -1).indices(10), (9, 9, -1)) |
| self.assertEqual(slice(None, 10, -1).indices(10), (9, 9, -1)) |
| |
| 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_setslice_without_getslice(self): |
| tmp = [] |
| class X(object): |
| def __setslice__(self, i, j, k): |
| tmp.append((i, j, k)) |
| |
| x = X() |
| with test_support.check_py3k_warnings(): |
| x[1:2] = 42 |
| self.assertEqual(tmp, [(1, 2, 42)]) |
| |
| def test_pickle(self): |
| s = slice(10, 20, 3) |
| for protocol in (0,1,2): |
| t = loads(dumps(s, protocol)) |
| self.assertEqual(s, t) |
| self.assertEqual(s.indices(15), t.indices(15)) |
| self.assertNotEqual(id(s), id(t)) |
| |
| def test_main(): |
| test_support.run_unittest(SliceTest) |
| |
| if __name__ == "__main__": |
| test_main() |
