134 lines
4.3 KiB
Python
134 lines
4.3 KiB
Python
# tests for slice objects; in particular the indices method.
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import unittest
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from test import test_support
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from cPickle import loads, dumps
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import sys
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class SliceTest(unittest.TestCase):
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def test_constructor(self):
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self.assertRaises(TypeError, slice)
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self.assertRaises(TypeError, slice, 1, 2, 3, 4)
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def test_repr(self):
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self.assertEqual(repr(slice(1, 2, 3)), "slice(1, 2, 3)")
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def test_hash(self):
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# Verify clearing of SF bug #800796
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self.assertRaises(TypeError, hash, slice(5))
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self.assertRaises(TypeError, slice(5).__hash__)
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def test_cmp(self):
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s1 = slice(1, 2, 3)
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s2 = slice(1, 2, 3)
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s3 = slice(1, 2, 4)
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self.assertEqual(s1, s2)
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self.assertNotEqual(s1, s3)
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class Exc(Exception):
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pass
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class BadCmp(object):
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def __eq__(self, other):
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raise Exc
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__hash__ = None # Silence Py3k warning
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s1 = slice(BadCmp())
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s2 = slice(BadCmp())
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self.assertRaises(Exc, cmp, s1, s2)
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self.assertEqual(s1, s1)
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s1 = slice(1, BadCmp())
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s2 = slice(1, BadCmp())
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self.assertEqual(s1, s1)
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self.assertRaises(Exc, cmp, s1, s2)
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s1 = slice(1, 2, BadCmp())
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s2 = slice(1, 2, BadCmp())
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self.assertEqual(s1, s1)
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self.assertRaises(Exc, cmp, s1, s2)
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def test_members(self):
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s = slice(1)
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self.assertEqual(s.start, None)
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self.assertEqual(s.stop, 1)
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self.assertEqual(s.step, None)
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s = slice(1, 2)
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self.assertEqual(s.start, 1)
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self.assertEqual(s.stop, 2)
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self.assertEqual(s.step, None)
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s = slice(1, 2, 3)
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self.assertEqual(s.start, 1)
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self.assertEqual(s.stop, 2)
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self.assertEqual(s.step, 3)
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class AnyClass:
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pass
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obj = AnyClass()
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s = slice(obj)
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self.assert_(s.stop is obj)
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def test_indices(self):
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self.assertEqual(slice(None ).indices(10), (0, 10, 1))
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self.assertEqual(slice(None, None, 2).indices(10), (0, 10, 2))
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self.assertEqual(slice(1, None, 2).indices(10), (1, 10, 2))
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self.assertEqual(slice(None, None, -1).indices(10), (9, -1, -1))
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self.assertEqual(slice(None, None, -2).indices(10), (9, -1, -2))
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self.assertEqual(slice(3, None, -2).indices(10), (3, -1, -2))
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# issue 3004 tests
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self.assertEqual(slice(None, -9).indices(10), (0, 1, 1))
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self.assertEqual(slice(None, -10).indices(10), (0, 0, 1))
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self.assertEqual(slice(None, -11).indices(10), (0, 0, 1))
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self.assertEqual(slice(None, -10, -1).indices(10), (9, 0, -1))
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self.assertEqual(slice(None, -11, -1).indices(10), (9, -1, -1))
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self.assertEqual(slice(None, -12, -1).indices(10), (9, -1, -1))
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self.assertEqual(slice(None, 9).indices(10), (0, 9, 1))
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self.assertEqual(slice(None, 10).indices(10), (0, 10, 1))
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self.assertEqual(slice(None, 11).indices(10), (0, 10, 1))
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self.assertEqual(slice(None, 8, -1).indices(10), (9, 8, -1))
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self.assertEqual(slice(None, 9, -1).indices(10), (9, 9, -1))
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self.assertEqual(slice(None, 10, -1).indices(10), (9, 9, -1))
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self.assertEqual(
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slice(-100, 100 ).indices(10),
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slice(None).indices(10)
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)
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self.assertEqual(
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slice(100, -100, -1).indices(10),
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slice(None, None, -1).indices(10)
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)
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self.assertEqual(slice(-100L, 100L, 2L).indices(10), (0, 10, 2))
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self.assertEqual(range(10)[::sys.maxint - 1], [0])
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self.assertRaises(OverflowError, slice(None).indices, 1L<<100)
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def test_setslice_without_getslice(self):
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tmp = []
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class X(object):
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def __setslice__(self, i, j, k):
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tmp.append((i, j, k))
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x = X()
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x[1:2] = 42
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self.assertEquals(tmp, [(1, 2, 42)])
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def test_pickle(self):
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s = slice(10, 20, 3)
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for protocol in (0,1,2):
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t = loads(dumps(s, protocol))
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self.assertEqual(s, t)
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self.assertEqual(s.indices(15), t.indices(15))
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self.assertNotEqual(id(s), id(t))
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def test_main():
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test_support.run_unittest(SliceTest)
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if __name__ == "__main__":
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test_main()
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