Lib.test.test_weakset.py Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jython Show documentation
Show all versions of jython Show documentation
Jython is an implementation of the high-level, dynamic, object-oriented
language Python written in 100% Pure Java, and seamlessly integrated with
the Java platform. It thus allows you to run Python on any Java platform.
# Jython specific notes:
#
# 1. Deletion (del) or reliance on going out of scope must be followed
# by a gc.collect(); use extra_collect() if a callback will be
# tested as well.
#
# 2. Avoid eventual consistency issues in the length computation by
# computing the len of the list of the WeakSet
#
# 3. Jython can weakly refer to any object, unlike CPython, so don't
# test for nonexistent TypeErrors
import unittest
from test import test_support
from test.test_weakref import extra_collect
from weakref import proxy, ref, WeakSet
import operator
import copy
import string
import os
from random import randrange, shuffle
import sys
import warnings
import collections
import gc
import contextlib
class Foo:
pass
class SomeClass(object):
def __init__(self, value):
self.value = value
def __eq__(self, other):
if type(other) != type(self):
return False
return other.value == self.value
def __ne__(self, other):
return not self.__eq__(other)
def __hash__(self):
return hash((SomeClass, self.value))
def __repr__(self):
return "SC(%s,%s)" % (self.value, id(self.value))
class RefCycle(object):
def __init__(self):
self.cycle = self
class TestWeakSet(unittest.TestCase):
def setUp(self):
# need to keep references to them
self.items = [SomeClass(c) for c in ('a', 'b', 'c')]
self.items2 = [SomeClass(c) for c in ('x', 'y', 'z')]
self.letters = [SomeClass(c) for c in string.ascii_letters]
self.ab_items = [SomeClass(c) for c in 'ab']
self.abcde_items = [SomeClass(c) for c in 'abcde']
self.def_items = [SomeClass(c) for c in 'def']
self.ab_weakset = WeakSet(self.ab_items)
self.abcde_weakset = WeakSet(self.abcde_items)
self.def_weakset = WeakSet(self.def_items)
self.s = WeakSet(self.items)
self.d = dict.fromkeys(self.items)
self.obj = SomeClass('F')
self.fs = WeakSet([self.obj])
def test_methods(self):
weaksetmethods = dir(WeakSet)
for method in dir(set):
if method == 'test_c_api' or method.startswith('_'):
continue
self.assertIn(method, weaksetmethods,
"WeakSet missing method " + method)
def test_new_or_init(self):
self.assertRaises(TypeError, WeakSet, [], 2)
def test_len(self):
self.assertEqual(len(self.s), len(self.d))
self.assertEqual(len(self.fs), 1)
del self.obj
test_support.gc_collect()
# len of weak collections is eventually consistent on
# Jython. In practice this does not matter because of the
# nature of weaksets - we cannot rely on what happens in the
# reaper thread and how it interacts with gc
self.assertIn(len(self.fs), (0, 1))
def test_contains(self):
for c in self.letters:
self.assertEqual(c in self.s, c in self.d)
# 1 is not weakref'able, but that TypeError is caught by __contains__
self.assertNotIn(1, self.s)
self.assertIn(self.obj, self.fs)
del self.obj
test_support.gc_collect()
self.assertNotIn(SomeClass('F'), self.fs)
def test_union(self):
u = self.s.union(self.items2)
for c in self.letters:
self.assertEqual(c in u, c in self.d or c in self.items2)
self.assertEqual(self.s, WeakSet(self.items))
self.assertEqual(type(u), WeakSet)
self.assertRaises(TypeError, self.s.union, [[]])
for C in set, frozenset, dict.fromkeys, list, tuple:
x = WeakSet(self.items + self.items2)
c = C(self.items2)
self.assertEqual(self.s.union(c), x)
del c
test_support.gc_collect()
self.assertEqual(len(list(u)), len(list(self.items)) + len(list(self.items2)))
self.items2.pop()
test_support.gc_collect()
self.assertEqual(len(list(u)), len(list(self.items)) + len(list(self.items2)))
def test_or(self):
i = self.s.union(self.items2)
self.assertEqual(self.s | set(self.items2), i)
self.assertEqual(self.s | frozenset(self.items2), i)
def test_intersection(self):
s = WeakSet(self.letters)
i = s.intersection(self.items2)
for c in self.letters:
self.assertEqual(c in i, c in self.items2 and c in self.letters)
self.assertEqual(s, WeakSet(self.letters))
self.assertEqual(type(i), WeakSet)
for C in set, frozenset, dict.fromkeys, list, tuple:
x = WeakSet([])
self.assertEqual(i.intersection(C(self.items)), x)
self.assertEqual(len(i), len(self.items2))
self.items2.pop()
test_support.gc_collect()
self.assertEqual(len(list(i)), len(list(self.items2)))
def test_isdisjoint(self):
self.assertTrue(self.s.isdisjoint(WeakSet(self.items2)))
self.assertTrue(not self.s.isdisjoint(WeakSet(self.letters)))
def test_and(self):
i = self.s.intersection(self.items2)
self.assertEqual(self.s & set(self.items2), i)
self.assertEqual(self.s & frozenset(self.items2), i)
def test_difference(self):
i = self.s.difference(self.items2)
for c in self.letters:
self.assertEqual(c in i, c in self.d and c not in self.items2)
self.assertEqual(self.s, WeakSet(self.items))
self.assertEqual(type(i), WeakSet)
self.assertRaises(TypeError, self.s.difference, [[]])
def test_sub(self):
i = self.s.difference(self.items2)
self.assertEqual(self.s - set(self.items2), i)
self.assertEqual(self.s - frozenset(self.items2), i)
def test_symmetric_difference(self):
i = self.s.symmetric_difference(self.items2)
for c in self.letters:
self.assertEqual(c in i, (c in self.d) ^ (c in self.items2))
self.assertEqual(self.s, WeakSet(self.items))
self.assertEqual(type(i), WeakSet)
self.assertRaises(TypeError, self.s.symmetric_difference, [[]])
self.assertEqual(len(i), len(self.items) + len(self.items2))
self.items2.pop()
test_support.gc_collect()
self.assertEqual(len(list(i)), len(list(self.items)) + len(list(self.items2)))
def test_xor(self):
i = self.s.symmetric_difference(self.items2)
self.assertEqual(self.s ^ set(self.items2), i)
self.assertEqual(self.s ^ frozenset(self.items2), i)
def test_sub_and_super(self):
self.assertTrue(self.ab_weakset <= self.abcde_weakset)
self.assertTrue(self.abcde_weakset <= self.abcde_weakset)
self.assertTrue(self.abcde_weakset >= self.ab_weakset)
self.assertFalse(self.abcde_weakset <= self.def_weakset)
self.assertFalse(self.abcde_weakset >= self.def_weakset)
self.assertTrue(set('a').issubset('abc'))
self.assertTrue(set('abc').issuperset('a'))
self.assertFalse(set('a').issubset('cbs'))
self.assertFalse(set('cbs').issuperset('a'))
def test_lt(self):
self.assertTrue(self.ab_weakset < self.abcde_weakset)
self.assertFalse(self.abcde_weakset < self.def_weakset)
self.assertFalse(self.ab_weakset < self.ab_weakset)
self.assertFalse(WeakSet() < WeakSet())
def test_gt(self):
self.assertTrue(self.abcde_weakset > self.ab_weakset)
self.assertFalse(self.abcde_weakset > self.def_weakset)
self.assertFalse(self.ab_weakset > self.ab_weakset)
self.assertFalse(WeakSet() > WeakSet())
def test_gc(self):
# Create a nest of cycles to exercise overall ref count check
s = WeakSet(Foo() for i in range(1000))
for elem in s:
elem.cycle = s
elem.sub = elem
elem.set = WeakSet([elem])
def test_subclass_with_custom_hash(self):
# Bug #1257731
class H(WeakSet):
def __hash__(self):
return int(id(self) & 0x7fffffff)
s=H()
f=set()
f.add(s)
self.assertIn(s, f)
f.remove(s)
f.add(s)
f.discard(s)
def test_init(self):
s = WeakSet()
s.__init__(self.items)
self.assertEqual(s, self.s)
s.__init__(self.items2)
self.assertEqual(s, WeakSet(self.items2))
self.assertRaises(TypeError, s.__init__, s, 2);
self.assertRaises(TypeError, s.__init__, 1);
def test_constructor_identity(self):
s = WeakSet(self.items)
t = WeakSet(s)
self.assertNotEqual(id(s), id(t))
def test_hash(self):
self.assertRaises(TypeError, hash, self.s)
def test_clear(self):
self.s.clear()
self.assertEqual(self.s, WeakSet([]))
self.assertEqual(len(self.s), 0)
def test_copy(self):
dup = self.s.copy()
self.assertEqual(self.s, dup)
self.assertNotEqual(id(self.s), id(dup))
def test_add(self):
x = SomeClass('Q')
self.s.add(x)
self.assertIn(x, self.s)
dup = self.s.copy()
self.s.add(x)
self.assertEqual(self.s, dup)
if not test_support.is_jython: # Jython/JVM can weakly reference list and other objects
self.assertRaises(TypeError, self.s.add, [])
self.fs.add(Foo())
test_support.gc_collect() # CPython assumes Foo() went out of scope and was collected, so ensure the same
self.assertEqual(len(list(self.fs)), 1)
self.fs.add(self.obj)
self.assertEqual(len(list(self.fs)), 1)
def test_remove(self):
x = SomeClass('a')
self.s.remove(x)
self.assertNotIn(x, self.s)
self.assertRaises(KeyError, self.s.remove, x)
if not test_support.is_jython: # Jython/JVM can weakly reference list and other objects
self.assertRaises(TypeError, self.s.remove, [])
def test_discard(self):
a, q = SomeClass('a'), SomeClass('Q')
self.s.discard(a)
self.assertNotIn(a, self.s)
self.s.discard(q)
if not test_support.is_jython: # Jython/JVM can weakly reference list and other objects
self.assertRaises(TypeError, self.s.discard, [])
def test_pop(self):
for i in range(len(self.s)):
elem = self.s.pop()
self.assertNotIn(elem, self.s)
self.assertRaises(KeyError, self.s.pop)
def test_update(self):
retval = self.s.update(self.items2)
self.assertEqual(retval, None)
for c in (self.items + self.items2):
self.assertIn(c, self.s)
self.assertRaises(TypeError, self.s.update, [[]])
def test_update_set(self):
self.s.update(set(self.items2))
for c in (self.items + self.items2):
self.assertIn(c, self.s)
def test_ior(self):
self.s |= set(self.items2)
for c in (self.items + self.items2):
self.assertIn(c, self.s)
def test_intersection_update(self):
retval = self.s.intersection_update(self.items2)
self.assertEqual(retval, None)
for c in (self.items + self.items2):
if c in self.items2 and c in self.items:
self.assertIn(c, self.s)
else:
self.assertNotIn(c, self.s)
self.assertRaises(TypeError, self.s.intersection_update, [[]])
def test_iand(self):
self.s &= set(self.items2)
for c in (self.items + self.items2):
if c in self.items2 and c in self.items:
self.assertIn(c, self.s)
else:
self.assertNotIn(c, self.s)
def test_difference_update(self):
retval = self.s.difference_update(self.items2)
self.assertEqual(retval, None)
for c in (self.items + self.items2):
if c in self.items and c not in self.items2:
self.assertIn(c, self.s)
else:
self.assertNotIn(c, self.s)
if not test_support.is_jython: # Jython/JVM can weakly reference list and other objects
self.assertRaises(TypeError, self.s.difference_update, [[]])
self.assertRaises(TypeError, self.s.symmetric_difference_update, [[]])
def test_isub(self):
self.s -= set(self.items2)
for c in (self.items + self.items2):
if c in self.items and c not in self.items2:
self.assertIn(c, self.s)
else:
self.assertNotIn(c, self.s)
def test_symmetric_difference_update(self):
retval = self.s.symmetric_difference_update(self.items2)
self.assertEqual(retval, None)
for c in (self.items + self.items2):
if (c in self.items) ^ (c in self.items2):
self.assertIn(c, self.s)
else:
self.assertNotIn(c, self.s)
self.assertRaises(TypeError, self.s.symmetric_difference_update, [[]])
def test_ixor(self):
self.s ^= set(self.items2)
for c in (self.items + self.items2):
if (c in self.items) ^ (c in self.items2):
self.assertIn(c, self.s)
else:
self.assertNotIn(c, self.s)
def test_inplace_on_self(self):
t = self.s.copy()
t |= t
self.assertEqual(t, self.s)
t &= t
self.assertEqual(t, self.s)
t -= t
self.assertEqual(t, WeakSet())
t = self.s.copy()
t ^= t
self.assertEqual(t, WeakSet())
def test_eq(self):
# issue 5964 (http://bugs.python.org/issue5964)
self.assertEqual(self.s, self.s)
self.assertEqual(self.s, WeakSet(self.items))
# Jython diverges here in the next test because it constructs
# WeakSet as a subclass of set; this seems to be the proper
# thing to do given what is the typical comparison
self.assertEqual(self.s, set(self.items))
self.assertNotEqual(self.s, list(self.items))
self.assertNotEqual(self.s, tuple(self.items))
self.assertNotEqual(self.s, 1)
def test_weak_destroy_while_iterating(self):
# Issue #7105: iterators shouldn't crash when a key is implicitly removed
# Create new items to be sure no-one else holds a reference
items = [SomeClass(c) for c in ('a', 'b', 'c')]
s = WeakSet(items)
it = iter(s)
next(it) # Trigger internal iteration
# Destroy an item
del items[-1]
test_support.gc_collect() # just in case
# We have removed either the first consumed items, or another one
self.assertIn(len(list(it)), [len(items), len(items) - 1])
del it
extra_collect()
# The removal has been committed
self.assertEqual(len(s), len(items))
def test_weak_destroy_and_mutate_while_iterating(self):
# Issue #7105: iterators shouldn't crash when a key is implicitly removed
items = [SomeClass(c) for c in string.ascii_letters]
s = WeakSet(items)
@contextlib.contextmanager
def testcontext():
try:
it = iter(s)
next(it)
# Schedule an item for removal and recreate it
u = SomeClass(str(items.pop()))
test_support.gc_collect() # just in case
yield u
finally:
it = None # should commit all removals
test_support.gc_collect()
with testcontext() as u:
self.assertNotIn(u, s)
with testcontext() as u:
self.assertRaises(KeyError, s.remove, u)
self.assertNotIn(u, s)
with testcontext() as u:
s.add(u)
self.assertIn(u, s)
t = s.copy()
with testcontext() as u:
s.update(t)
self.assertEqual(len(s), len(t))
with testcontext() as u:
s.clear()
self.assertEqual(len(s), 0)
def test_len_cycles(self):
N = 20
items = [RefCycle() for i in range(N)]
s = WeakSet(items)
del items
# do some gc
test_support.gc_collect()
it = iter(s)
try:
next(it)
except StopIteration:
pass
# do some gc
test_support.gc_collect()
n1 = len(s)
del it
# do some gc
test_support.gc_collect()
n2 = len(s)
# one item may be kept alive inside the iterator
self.assertIn(n1, (0, 1))
self.assertEqual(n2, 0)
@unittest.skipIf(test_support.is_jython, "GarbageCollection not deterministic in Jython")
def test_len_race(self):
# Extended sanity checks for len() in the face of cyclic collection
self.addCleanup(gc.set_threshold, *gc.get_threshold())
for th in range(1, 100):
N = 20
gc.collect(0)
gc.set_threshold(th, th, th)
items = [RefCycle() for i in range(N)]
s = WeakSet(items)
del items
# All items will be collected at next garbage collection pass
it = iter(s)
try:
next(it)
except StopIteration:
pass
n1 = len(s)
del it
n2 = len(s)
self.assertGreaterEqual(n1, 0)
self.assertLessEqual(n1, N)
self.assertGreaterEqual(n2, 0)
self.assertLessEqual(n2, n1)
def test_main(verbose=None):
test_support.run_unittest(TestWeakSet)
if __name__ == "__main__":
test_main(verbose=True)