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440 lines
15 KiB
Python
440 lines
15 KiB
Python
import unittest
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from weakref import WeakSet
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import string
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from collections import UserString as ustr
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import gc
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import contextlib
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class Foo:
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pass
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class RefCycle:
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def __init__(self):
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self.cycle = self
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class TestWeakSet(unittest.TestCase):
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def setUp(self):
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# need to keep references to them
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self.items = [ustr(c) for c in ('a', 'b', 'c')]
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self.items2 = [ustr(c) for c in ('x', 'y', 'z')]
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self.ab_items = [ustr(c) for c in 'ab']
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self.abcde_items = [ustr(c) for c in 'abcde']
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self.def_items = [ustr(c) for c in 'def']
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self.ab_weakset = WeakSet(self.ab_items)
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self.abcde_weakset = WeakSet(self.abcde_items)
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self.def_weakset = WeakSet(self.def_items)
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self.letters = [ustr(c) for c in string.ascii_letters]
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self.s = WeakSet(self.items)
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self.d = dict.fromkeys(self.items)
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self.obj = ustr('F')
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self.fs = WeakSet([self.obj])
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def test_methods(self):
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weaksetmethods = dir(WeakSet)
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for method in dir(set):
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if method == 'test_c_api' or method.startswith('_'):
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continue
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self.assertIn(method, weaksetmethods,
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"WeakSet missing method " + method)
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def test_new_or_init(self):
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self.assertRaises(TypeError, WeakSet, [], 2)
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def test_len(self):
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self.assertEqual(len(self.s), len(self.d))
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self.assertEqual(len(self.fs), 1)
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del self.obj
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self.assertEqual(len(self.fs), 0)
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def test_contains(self):
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for c in self.letters:
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self.assertEqual(c in self.s, c in self.d)
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# 1 is not weakref'able, but that TypeError is caught by __contains__
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self.assertNotIn(1, self.s)
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self.assertIn(self.obj, self.fs)
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del self.obj
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self.assertNotIn(ustr('F'), self.fs)
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def test_union(self):
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u = self.s.union(self.items2)
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for c in self.letters:
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self.assertEqual(c in u, c in self.d or c in self.items2)
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self.assertEqual(self.s, WeakSet(self.items))
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self.assertEqual(type(u), WeakSet)
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self.assertRaises(TypeError, self.s.union, [[]])
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for C in set, frozenset, dict.fromkeys, list, tuple:
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x = WeakSet(self.items + self.items2)
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c = C(self.items2)
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self.assertEqual(self.s.union(c), x)
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del c
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self.assertEqual(len(u), len(self.items) + len(self.items2))
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self.items2.pop()
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gc.collect()
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self.assertEqual(len(u), len(self.items) + len(self.items2))
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def test_or(self):
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i = self.s.union(self.items2)
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self.assertEqual(self.s | set(self.items2), i)
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self.assertEqual(self.s | frozenset(self.items2), i)
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def test_intersection(self):
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s = WeakSet(self.letters)
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i = s.intersection(self.items2)
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for c in self.letters:
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self.assertEqual(c in i, c in self.items2 and c in self.letters)
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self.assertEqual(s, WeakSet(self.letters))
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self.assertEqual(type(i), WeakSet)
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for C in set, frozenset, dict.fromkeys, list, tuple:
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x = WeakSet([])
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self.assertEqual(i.intersection(C(self.items)), x)
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self.assertEqual(len(i), len(self.items2))
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self.items2.pop()
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gc.collect()
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self.assertEqual(len(i), len(self.items2))
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def test_isdisjoint(self):
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self.assertTrue(self.s.isdisjoint(WeakSet(self.items2)))
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self.assertTrue(not self.s.isdisjoint(WeakSet(self.letters)))
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def test_and(self):
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i = self.s.intersection(self.items2)
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self.assertEqual(self.s & set(self.items2), i)
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self.assertEqual(self.s & frozenset(self.items2), i)
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def test_difference(self):
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i = self.s.difference(self.items2)
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for c in self.letters:
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self.assertEqual(c in i, c in self.d and c not in self.items2)
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self.assertEqual(self.s, WeakSet(self.items))
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self.assertEqual(type(i), WeakSet)
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self.assertRaises(TypeError, self.s.difference, [[]])
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def test_sub(self):
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i = self.s.difference(self.items2)
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self.assertEqual(self.s - set(self.items2), i)
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self.assertEqual(self.s - frozenset(self.items2), i)
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def test_symmetric_difference(self):
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i = self.s.symmetric_difference(self.items2)
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for c in self.letters:
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self.assertEqual(c in i, (c in self.d) ^ (c in self.items2))
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self.assertEqual(self.s, WeakSet(self.items))
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self.assertEqual(type(i), WeakSet)
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self.assertRaises(TypeError, self.s.symmetric_difference, [[]])
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self.assertEqual(len(i), len(self.items) + len(self.items2))
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self.items2.pop()
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gc.collect()
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self.assertEqual(len(i), len(self.items) + len(self.items2))
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def test_xor(self):
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i = self.s.symmetric_difference(self.items2)
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self.assertEqual(self.s ^ set(self.items2), i)
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self.assertEqual(self.s ^ frozenset(self.items2), i)
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def test_sub_and_super(self):
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self.assertTrue(self.ab_weakset <= self.abcde_weakset)
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self.assertTrue(self.abcde_weakset <= self.abcde_weakset)
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self.assertTrue(self.abcde_weakset >= self.ab_weakset)
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self.assertFalse(self.abcde_weakset <= self.def_weakset)
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self.assertFalse(self.abcde_weakset >= self.def_weakset)
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self.assertTrue(set('a').issubset('abc'))
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self.assertTrue(set('abc').issuperset('a'))
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self.assertFalse(set('a').issubset('cbs'))
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self.assertFalse(set('cbs').issuperset('a'))
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def test_lt(self):
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self.assertTrue(self.ab_weakset < self.abcde_weakset)
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self.assertFalse(self.abcde_weakset < self.def_weakset)
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self.assertFalse(self.ab_weakset < self.ab_weakset)
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self.assertFalse(WeakSet() < WeakSet())
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def test_gt(self):
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self.assertTrue(self.abcde_weakset > self.ab_weakset)
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self.assertFalse(self.abcde_weakset > self.def_weakset)
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self.assertFalse(self.ab_weakset > self.ab_weakset)
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self.assertFalse(WeakSet() > WeakSet())
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def test_gc(self):
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# Create a nest of cycles to exercise overall ref count check
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s = WeakSet(Foo() for i in range(1000))
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for elem in s:
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elem.cycle = s
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elem.sub = elem
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elem.set = WeakSet([elem])
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def test_subclass_with_custom_hash(self):
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# Bug #1257731
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class H(WeakSet):
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def __hash__(self):
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return int(id(self) & 0x7fffffff)
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s=H()
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f=set()
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f.add(s)
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self.assertIn(s, f)
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f.remove(s)
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f.add(s)
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f.discard(s)
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def test_init(self):
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s = WeakSet()
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s.__init__(self.items)
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self.assertEqual(s, self.s)
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s.__init__(self.items2)
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self.assertEqual(s, WeakSet(self.items2))
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self.assertRaises(TypeError, s.__init__, s, 2);
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self.assertRaises(TypeError, s.__init__, 1);
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def test_constructor_identity(self):
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s = WeakSet(self.items)
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t = WeakSet(s)
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self.assertNotEqual(id(s), id(t))
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def test_hash(self):
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self.assertRaises(TypeError, hash, self.s)
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def test_clear(self):
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self.s.clear()
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self.assertEqual(self.s, WeakSet([]))
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self.assertEqual(len(self.s), 0)
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def test_copy(self):
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dup = self.s.copy()
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self.assertEqual(self.s, dup)
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self.assertNotEqual(id(self.s), id(dup))
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def test_add(self):
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x = ustr('Q')
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self.s.add(x)
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self.assertIn(x, self.s)
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dup = self.s.copy()
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self.s.add(x)
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self.assertEqual(self.s, dup)
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self.assertRaises(TypeError, self.s.add, [])
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self.fs.add(Foo())
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self.assertTrue(len(self.fs) == 1)
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self.fs.add(self.obj)
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self.assertTrue(len(self.fs) == 1)
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def test_remove(self):
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x = ustr('a')
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self.s.remove(x)
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self.assertNotIn(x, self.s)
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self.assertRaises(KeyError, self.s.remove, x)
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self.assertRaises(TypeError, self.s.remove, [])
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def test_discard(self):
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a, q = ustr('a'), ustr('Q')
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self.s.discard(a)
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self.assertNotIn(a, self.s)
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self.s.discard(q)
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self.assertRaises(TypeError, self.s.discard, [])
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def test_pop(self):
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for i in range(len(self.s)):
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elem = self.s.pop()
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self.assertNotIn(elem, self.s)
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self.assertRaises(KeyError, self.s.pop)
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def test_update(self):
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retval = self.s.update(self.items2)
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self.assertEqual(retval, None)
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for c in (self.items + self.items2):
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self.assertIn(c, self.s)
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self.assertRaises(TypeError, self.s.update, [[]])
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def test_update_set(self):
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self.s.update(set(self.items2))
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for c in (self.items + self.items2):
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self.assertIn(c, self.s)
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def test_ior(self):
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self.s |= set(self.items2)
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for c in (self.items + self.items2):
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self.assertIn(c, self.s)
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def test_intersection_update(self):
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retval = self.s.intersection_update(self.items2)
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self.assertEqual(retval, None)
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for c in (self.items + self.items2):
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if c in self.items2 and c in self.items:
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self.assertIn(c, self.s)
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else:
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self.assertNotIn(c, self.s)
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self.assertRaises(TypeError, self.s.intersection_update, [[]])
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def test_iand(self):
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self.s &= set(self.items2)
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for c in (self.items + self.items2):
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if c in self.items2 and c in self.items:
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self.assertIn(c, self.s)
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else:
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self.assertNotIn(c, self.s)
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def test_difference_update(self):
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retval = self.s.difference_update(self.items2)
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self.assertEqual(retval, None)
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for c in (self.items + self.items2):
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if c in self.items and c not in self.items2:
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self.assertIn(c, self.s)
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else:
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self.assertNotIn(c, self.s)
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self.assertRaises(TypeError, self.s.difference_update, [[]])
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self.assertRaises(TypeError, self.s.symmetric_difference_update, [[]])
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def test_isub(self):
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self.s -= set(self.items2)
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for c in (self.items + self.items2):
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if c in self.items and c not in self.items2:
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self.assertIn(c, self.s)
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else:
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self.assertNotIn(c, self.s)
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def test_symmetric_difference_update(self):
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retval = self.s.symmetric_difference_update(self.items2)
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self.assertEqual(retval, None)
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for c in (self.items + self.items2):
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if (c in self.items) ^ (c in self.items2):
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self.assertIn(c, self.s)
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else:
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self.assertNotIn(c, self.s)
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self.assertRaises(TypeError, self.s.symmetric_difference_update, [[]])
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def test_ixor(self):
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self.s ^= set(self.items2)
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for c in (self.items + self.items2):
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if (c in self.items) ^ (c in self.items2):
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self.assertIn(c, self.s)
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else:
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self.assertNotIn(c, self.s)
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def test_inplace_on_self(self):
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t = self.s.copy()
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t |= t
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self.assertEqual(t, self.s)
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t &= t
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self.assertEqual(t, self.s)
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t -= t
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self.assertEqual(t, WeakSet())
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t = self.s.copy()
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t ^= t
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self.assertEqual(t, WeakSet())
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def test_eq(self):
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# issue 5964
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self.assertTrue(self.s == self.s)
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self.assertTrue(self.s == WeakSet(self.items))
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self.assertFalse(self.s == set(self.items))
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self.assertFalse(self.s == list(self.items))
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self.assertFalse(self.s == tuple(self.items))
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self.assertFalse(self.s == WeakSet([Foo]))
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self.assertFalse(self.s == 1)
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def test_ne(self):
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self.assertTrue(self.s != set(self.items))
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s1 = WeakSet()
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s2 = WeakSet()
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self.assertFalse(s1 != s2)
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def test_weak_destroy_while_iterating(self):
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# Issue #7105: iterators shouldn't crash when a key is implicitly removed
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# Create new items to be sure no-one else holds a reference
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items = [ustr(c) for c in ('a', 'b', 'c')]
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s = WeakSet(items)
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it = iter(s)
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next(it) # Trigger internal iteration
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# Destroy an item
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del items[-1]
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gc.collect() # just in case
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# We have removed either the first consumed items, or another one
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self.assertIn(len(list(it)), [len(items), len(items) - 1])
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del it
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# The removal has been committed
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self.assertEqual(len(s), len(items))
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def test_weak_destroy_and_mutate_while_iterating(self):
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# Issue #7105: iterators shouldn't crash when a key is implicitly removed
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items = [ustr(c) for c in string.ascii_letters]
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s = WeakSet(items)
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@contextlib.contextmanager
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def testcontext():
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try:
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it = iter(s)
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# Start iterator
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yielded = ustr(str(next(it)))
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# Schedule an item for removal and recreate it
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u = ustr(str(items.pop()))
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if yielded == u:
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# The iterator still has a reference to the removed item,
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# advance it (issue #20006).
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next(it)
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gc.collect() # just in case
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yield u
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finally:
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it = None # should commit all removals
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with testcontext() as u:
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self.assertNotIn(u, s)
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with testcontext() as u:
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self.assertRaises(KeyError, s.remove, u)
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self.assertNotIn(u, s)
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with testcontext() as u:
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s.add(u)
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self.assertIn(u, s)
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t = s.copy()
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with testcontext() as u:
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s.update(t)
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self.assertEqual(len(s), len(t))
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with testcontext() as u:
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s.clear()
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self.assertEqual(len(s), 0)
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def test_len_cycles(self):
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N = 20
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items = [RefCycle() for i in range(N)]
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s = WeakSet(items)
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del items
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it = iter(s)
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try:
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next(it)
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except StopIteration:
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pass
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gc.collect()
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n1 = len(s)
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del it
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gc.collect()
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n2 = len(s)
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# one item may be kept alive inside the iterator
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self.assertIn(n1, (0, 1))
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self.assertEqual(n2, 0)
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def test_len_race(self):
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# Extended sanity checks for len() in the face of cyclic collection
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self.addCleanup(gc.set_threshold, *gc.get_threshold())
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for th in range(1, 100):
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N = 20
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gc.collect(0)
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gc.set_threshold(th, th, th)
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items = [RefCycle() for i in range(N)]
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s = WeakSet(items)
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del items
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# All items will be collected at next garbage collection pass
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it = iter(s)
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try:
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next(it)
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except StopIteration:
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pass
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n1 = len(s)
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del it
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n2 = len(s)
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self.assertGreaterEqual(n1, 0)
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self.assertLessEqual(n1, N)
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self.assertGreaterEqual(n2, 0)
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self.assertLessEqual(n2, n1)
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if __name__ == "__main__":
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unittest.main()
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