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99 lines
2.8 KiB
Python
99 lines
2.8 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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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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s1 = slice(BadCmp())
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s2 = slice(BadCmp())
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self.assertEqual(s1, s1)
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self.assertRaises(Exc, lambda: s1 == s2)
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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, lambda: 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, lambda: 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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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(-100, 100, 2).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, 1<<100)
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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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