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110 lines
3.4 KiB
110 lines
3.4 KiB
3 years ago
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from collections import deque
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import unittest
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from test.support import NEVER_EQ
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class base_set:
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def __init__(self, el):
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self.el = el
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class myset(base_set):
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def __contains__(self, el):
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return self.el == el
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class seq(base_set):
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def __getitem__(self, n):
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return [self.el][n]
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class TestContains(unittest.TestCase):
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def test_common_tests(self):
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a = base_set(1)
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b = myset(1)
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c = seq(1)
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self.assertIn(1, b)
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self.assertNotIn(0, b)
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self.assertIn(1, c)
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self.assertNotIn(0, c)
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self.assertRaises(TypeError, lambda: 1 in a)
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self.assertRaises(TypeError, lambda: 1 not in a)
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# test char in string
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self.assertIn('c', 'abc')
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self.assertNotIn('d', 'abc')
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self.assertIn('', '')
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self.assertIn('', 'abc')
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self.assertRaises(TypeError, lambda: None in 'abc')
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def test_builtin_sequence_types(self):
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# a collection of tests on builtin sequence types
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a = range(10)
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for i in a:
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self.assertIn(i, a)
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self.assertNotIn(16, a)
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self.assertNotIn(a, a)
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a = tuple(a)
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for i in a:
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self.assertIn(i, a)
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self.assertNotIn(16, a)
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self.assertNotIn(a, a)
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class Deviant1:
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"""Behaves strangely when compared
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This class is designed to make sure that the contains code
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works when the list is modified during the check.
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"""
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aList = list(range(15))
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def __eq__(self, other):
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if other == 12:
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self.aList.remove(12)
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self.aList.remove(13)
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self.aList.remove(14)
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return 0
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self.assertNotIn(Deviant1(), Deviant1.aList)
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def test_nonreflexive(self):
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# containment and equality tests involving elements that are
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# not necessarily equal to themselves
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values = float('nan'), 1, None, 'abc', NEVER_EQ
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constructors = list, tuple, dict.fromkeys, set, frozenset, deque
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for constructor in constructors:
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container = constructor(values)
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for elem in container:
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self.assertIn(elem, container)
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self.assertTrue(container == constructor(values))
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self.assertTrue(container == container)
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def test_block_fallback(self):
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# blocking fallback with __contains__ = None
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class ByContains(object):
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def __contains__(self, other):
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return False
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c = ByContains()
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class BlockContains(ByContains):
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"""Is not a container
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This class is a perfectly good iterable (as tested by
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list(bc)), as well as inheriting from a perfectly good
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container, but __contains__ = None prevents the usual
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fallback to iteration in the container protocol. That
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is, normally, 0 in bc would fall back to the equivalent
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of any(x==0 for x in bc), but here it's blocked from
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doing so.
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"""
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def __iter__(self):
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while False:
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yield None
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__contains__ = None
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bc = BlockContains()
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self.assertFalse(0 in c)
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self.assertFalse(0 in list(bc))
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self.assertRaises(TypeError, lambda: 0 in bc)
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if __name__ == '__main__':
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unittest.main()
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