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class AppTestWeakref(object):
spaceconfig = dict(usemodules=('_weakref',))
def setup_class(cls):
cls.w_runappdirect = cls.space.wrap(cls.runappdirect)
def test_simple(self):
import _weakref, gc
class A(object):
pass
a = A()
assert _weakref.getweakrefcount(a) == 0
ref = _weakref.ref(a)
assert ref() is a
assert a.__weakref__ is ref
assert _weakref.getweakrefcount(a) == 1
del a
gc.collect()
assert ref() is None
def test_missing_arg(self):
import _weakref
raises(TypeError, _weakref.ref)
def test_no_kwargs(self):
import _weakref
class C(object):
pass
raises(TypeError, _weakref.ref, C(), callback=None)
def test_callback(self):
import _weakref, gc
class A(object):
pass
a1 = A()
a2 = A()
def callback(ref):
a2.ref = ref()
ref1 = _weakref.ref(a1, callback)
ref2 = _weakref.ref(a1)
assert ref1.__callback__ is callback
assert ref2.__callback__ is None
assert _weakref.getweakrefcount(a1) == 2
del a1
gc.collect()
assert ref1() is None
assert ref1.__callback__ is None
assert a2.ref is None
def test_callback_order(self):
import _weakref, gc
class A(object):
pass
a1 = A()
a2 = A()
def callback1(ref):
a2.x = 42
def callback2(ref):
a2.x = 43
ref1 = _weakref.ref(a1, callback1)
ref2 = _weakref.ref(a1, callback2)
del a1
gc.collect()
assert a2.x == 42
def test_dont_callback_if_weakref_dead(self):
import _weakref, gc
class A(object):
pass
a1 = A()
a1.x = 40
a2 = A()
def callback(ref):
a1.x = 42
assert _weakref.getweakrefcount(a2) == 0
ref = _weakref.ref(a2, callback)
assert _weakref.getweakrefcount(a2) == 1
ref = None
gc.collect()
assert _weakref.getweakrefcount(a2) == 0
a2 = None
gc.collect()
assert a1.x == 40
def test_callback_cannot_ressurect(self):
import _weakref, gc
class A(object):
pass
a = A()
alive = A()
alive.a = 1
def callback(ref2):
alive.a = ref1()
ref1 = _weakref.ref(a, callback)
ref2 = _weakref.ref(a, callback)
del a
gc.collect()
assert alive.a is None
def test_weakref_reusing(self):
import _weakref, gc
class A(object):
pass
a = A()
ref1 = _weakref.ref(a)
ref2 = _weakref.ref(a)
assert ref1 is ref2
class wref(_weakref.ref):
pass
wref1 = wref(a)
assert isinstance(wref1, wref)
def test_correct_weakrefcount_after_death(self):
import _weakref, gc
class A(object):
pass
a = A()
ref1 = _weakref.ref(a)
ref2 = _weakref.ref(a)
assert _weakref.getweakrefcount(a) == 1
del ref1
gc.collect()
assert _weakref.getweakrefcount(a) == 1
del ref2
gc.collect()
assert _weakref.getweakrefcount(a) == 0
def test_weakref_equality(self):
import _weakref, gc
class A(object):
def __eq__(self, other):
return True
def __ne__(self, other):
return False
a1 = A()
a2 = A()
ref1 = _weakref.ref(a1)
ref2 = _weakref.ref(a2)
assert ref1 == ref2
assert not (ref1 != ref2)
assert not (ref1 == [])
assert ref1 != []
del a1
gc.collect()
assert not ref1 == ref2
assert ref1 != ref2
assert not (ref1 == [])
assert ref1 != []
del a2
gc.collect()
assert not ref1 == ref2
assert ref1 != ref2
assert not (ref1 == [])
assert ref1 != []
def test_ne(self):
import _weakref
class X(object):
pass
ref1 = _weakref.ref(X())
assert ref1.__eq__(X()) is NotImplemented
assert ref1.__ne__(X()) is NotImplemented
def test_getweakrefs(self):
import _weakref, gc
class A(object):
pass
a = A()
assert _weakref.getweakrefs(a) == []
assert _weakref.getweakrefs(None) == []
ref1 = _weakref.ref(a)
assert _weakref.getweakrefs(a) == [ref1]
def test_hashing(self):
import _weakref, gc
class A(object):
def __hash__(self):
return 42
a = A()
w = _weakref.ref(a)
assert hash(a) == hash(w)
del a
gc.collect()
assert hash(w) == 42
w = _weakref.ref(A())
gc.collect()
raises(TypeError, hash, w)
def test_weakref_subclassing(self):
import _weakref, gc
class A(object):
pass
class Ref(_weakref.ref):
def __init__(self, ob, callback=None, **other):
self.__dict__.update(other)
def callable(ref):
b.a = 42
a = A()
b = A()
b.a = 1
w = Ref(a, callable, x=1, y=2)
assert w.x == 1
assert w.y == 2
assert a.__weakref__ is w
assert b.__weakref__ is None
w1 = _weakref.ref(a)
w2 = _weakref.ref(a, callable)
assert a.__weakref__ is w1
del a
gc.collect()
assert w1() is None
assert w() is None
assert w2() is None
assert b.a == 42
def test_function_weakrefable(self):
import _weakref, gc
def f(x):
return 42
wf = _weakref.ref(f)
assert wf()(63) == 42
del f
gc.collect()
assert wf() is None
def test_method_weakrefable(self):
import _weakref, gc
class A(object):
def f(self):
return 42
a = A()
meth = A.f
w_unbound = _weakref.ref(meth)
assert w_unbound()(A()) == 42
meth = A().f
w_bound = _weakref.ref(meth)
assert w_bound()() == 42
del meth
gc.collect()
# it used to be None on py2, but now there is no longer a newly
# created unbound method object
assert w_unbound() is A.f
assert w_bound() is None
def test_set_weakrefable(self):
import _weakref, gc
s = set([1, 2, 3, 4])
w = _weakref.ref(s)
assert w() is s
del s
gc.collect()
assert w() is None
def test_generator_weakrefable(self):
import _weakref, gc
def f(x):
for i in range(x):
yield i
g = f(10)
w = _weakref.ref(g)
r = next(w())
assert r == 0
r = next(g)
assert r == 1
del g
gc.collect()
assert w() is None
g = f(10)
w = _weakref.ref(g)
assert list(g) == list(range(10))
del g
gc.collect()
assert w() is None
def test_weakref_subclass_with_del(self):
import _weakref, gc
class Ref(_weakref.ref):
def __del__(self):
b.a = 42
class A(object):
pass
a = A()
b = A()
b.a = 1
w = Ref(a)
del w
gc.collect()
assert b.a == 42
if _weakref.getweakrefcount(a) > 0:
# the following can crash if the presence of the applevel __del__
# leads to the fact that the __del__ of _weakref.ref is not called.
assert _weakref.getweakrefs(a)[0]() is a
def test_buggy_case(self):
import gc, weakref
gone = []
class A(object):
def __del__(self):
gone.append(True)
a = A()
w = weakref.ref(a)
del a
tries = 5
for i in range(5):
if not gone:
gc.collect()
if gone:
a1 = w()
assert a1 is None
def test_del_and_callback_and_id(self):
if not self.runappdirect:
skip("the id() doesn't work correctly in __del__ and "
"callbacks before translation")
import gc, weakref
seen_del = []
class A(object):
def __del__(self):
seen_del.append(id(self))
seen_del.append(w1() is None)
seen_del.append(w2() is None)
seen_callback = []
def callback(r):
seen_callback.append(r is w2)
seen_callback.append(w1() is None)
seen_callback.append(w2() is None)
a = A()
w1 = weakref.ref(a)
w2 = weakref.ref(a, callback)
aid = id(a)
del a
for i in range(5):
gc.collect()
if seen_del:
assert seen_del == [aid, True, True]
if seen_callback:
assert seen_callback == [True, True, True]
def test_type_weakrefable(self):
import _weakref, gc
w = _weakref.ref(list)
assert w() is list
gc.collect()
assert w() is list
class AppTestProxy(object):
spaceconfig = dict(usemodules=('_weakref',))
def test_simple(self):
import _weakref, gc
class A(object):
def __init__(self, x):
self.x = x
a = A(1)
p = _weakref.proxy(a)
assert p.x == 1
assert str(p) == str(a)
raises(TypeError, p)
def test_caching(self):
import _weakref, gc
class A(object): pass
a = A()
assert _weakref.proxy(a) is _weakref.proxy(a)
assert _weakref.proxy(a) is _weakref.proxy(a, None)
def test_callable_proxy(self):
import _weakref, gc
class A(object):
def __call__(self):
global_a.x = 1
global_a = A()
global_a.x = 41
A_ = _weakref.proxy(A)
a = A_()
assert isinstance(a, A)
a_ = _weakref.proxy(a)
a_()
assert global_a.x == 1
def test_callable_proxy_type(self):
import _weakref, gc
class Callable(object):
def __call__(self, x):
pass
o = Callable()
ref1 = _weakref.proxy(o)
assert type(ref1) is _weakref.CallableProxyType
def test_dont_create_directly(self):
import _weakref, gc
raises(TypeError, _weakref.ProxyType, [])
raises(TypeError, _weakref.CallableProxyType, [])
def test_dont_hash(self):
import _weakref, gc
class A(object):
pass
a = A()
p = _weakref.proxy(a)
raises(TypeError, hash, p)
def test_subclassing_not_allowed(self):
import _weakref, gc
def tryit():
class A(_weakref.ProxyType):
pass
return A
raises(TypeError, tryit)
def test_proxy_to_dead_object(self):
import _weakref, gc
class A(object):
pass
p = _weakref.proxy(A())
gc.collect()
raises(ReferenceError, "p + 1")
def test_proxy_with_callback(self):
import _weakref, gc
class A(object):
pass
a2 = A()
def callback(proxy):
a2.seen = proxy
p = _weakref.proxy(A(), callback)
gc.collect()
raises(ReferenceError, "p + 1")
assert a2.seen is p
def test_repr(self):
import _weakref, gc
for kind in ('ref', 'proxy'):
def foobaz():
"A random function not returning None."
return 42
w = getattr(_weakref, kind)(foobaz)
s = repr(w)
print(s)
if kind == 'ref':
assert s.startswith('<weakref at ')
else:
assert (s.startswith('<weakproxy at ') or
s.startswith('<weakcallableproxy at '))
assert "function" in s
del foobaz
try:
for i in range(10):
if w() is None:
break # only reachable if kind == 'ref'
gc.collect()
except ReferenceError:
pass # only reachable if kind == 'proxy'
s = repr(w)
print(s)
assert "dead" in s
def test_bytes(self):
import _weakref
class C(object):
def __bytes__(self):
return b"string"
instance = C()
assert "__bytes__" in dir(_weakref.proxy(instance))
assert bytes(_weakref.proxy(instance)) == b"string"
def test_eq(self):
import _weakref
class A(object):
pass
a = A()
assert not(_weakref.ref(a) == a)
assert _weakref.ref(a) != a
class A(object):
def __eq__(self, other):
return True
def __ne__(self, other):
return False
a = A()
assert _weakref.ref(a) == a
def test_callback_raises(self):
import _weakref, gc
class A(object):
pass
a1 = A()
def callback(ref):
explode
ref1 = _weakref.ref(a1, callback)
del a1
gc.collect()
assert ref1() is None
def test_init(self):
import _weakref, gc
# Issue 3634
# <weakref to class>.__init__() doesn't check errors correctly
r = _weakref.ref(Exception)
raises(TypeError, r.__init__, 0, 0, 0, 0, 0)
# No exception should be raised here
gc.collect()
def test_add(self):
import _weakref
class A(object):
def __add__(self, other):
return other
a1 = A()
a2 = A()
p1 = _weakref.proxy(a1)
p2 = _weakref.proxy(a2)
a3 = p1 + p2
assert a3 is a2
def test_inplace_add(self):
import _weakref
class A(object):
def __add__(self, other):
return other
a1 = A()
a2 = A()
p1 = _weakref.proxy(a1)
p2 = _weakref.proxy(a2)
p1 += p2
assert p1 is a2
def test_setattr(self):
import _weakref
class A(object):
def __setitem__(self, key, value):
self.setkey = key
self.setvalue = value
a1 = A()
a2 = A()
p1 = _weakref.proxy(a1)
p2 = _weakref.proxy(a2)
p1[p2] = 42
assert a1.setkey is p2
assert a1.setvalue == 42
#
p1[42] = p2
assert a1.setkey == 42
assert a1.setvalue is p2
|
