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266 lines
8.2 KiB
Python
266 lines
8.2 KiB
Python
import sys
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import unittest
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import weakref
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from test_support import run_unittest, verify
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class C:
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def method(self):
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pass
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class Callable:
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bar = None
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def __call__(self, x):
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self.bar = x
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def create_function():
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def f(): pass
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return f
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def create_bound_method():
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return C().method
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def create_unbound_method():
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return C.method
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class TestBase(unittest.TestCase):
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def setUp(self):
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self.cbcalled = 0
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def callback(self, ref):
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self.cbcalled += 1
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class ReferencesTestCase(TestBase):
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def test_basic_ref(self):
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self.check_basic_ref(C)
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self.check_basic_ref(create_function)
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self.check_basic_ref(create_bound_method)
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self.check_basic_ref(create_unbound_method)
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def test_basic_callback(self):
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self.check_basic_callback(C)
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self.check_basic_callback(create_function)
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self.check_basic_callback(create_bound_method)
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self.check_basic_callback(create_unbound_method)
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def test_multiple_callbacks(self):
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o = C()
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ref1 = weakref.ref(o, self.callback)
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ref2 = weakref.ref(o, self.callback)
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del o
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self.assert_(ref1() is None,
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"expected reference to be invalidated")
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self.assert_(ref2() is None,
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"expected reference to be invalidated")
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self.assert_(self.cbcalled == 2,
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"callback not called the right number of times")
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def test_proxy_ref(self):
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o = C()
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o.bar = 1
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ref1 = weakref.proxy(o, self.callback)
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ref2 = weakref.proxy(o, self.callback)
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del o
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def check(proxy):
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proxy.bar
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self.assertRaises(weakref.ReferenceError, check, ref1)
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self.assertRaises(weakref.ReferenceError, check, ref2)
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self.assert_(self.cbcalled == 2)
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def check_basic_ref(self, factory):
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o = factory()
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ref = weakref.ref(o)
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self.assert_(ref() is not None,
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"weak reference to live object should be live")
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o2 = ref()
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self.assert_(o is o2,
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"<ref>() should return original object if live")
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def check_basic_callback(self, factory):
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self.cbcalled = 0
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o = factory()
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ref = weakref.ref(o, self.callback)
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del o
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verify(self.cbcalled == 1,
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"callback did not properly set 'cbcalled'")
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verify(ref() is None,
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"ref2 should be dead after deleting object reference")
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def test_ref_reuse(self):
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o = C()
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ref1 = weakref.ref(o)
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# create a proxy to make sure that there's an intervening creation
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# between these two; it should make no difference
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proxy = weakref.proxy(o)
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ref2 = weakref.ref(o)
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self.assert_(ref1 is ref2,
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"reference object w/out callback should be re-used")
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o = C()
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proxy = weakref.proxy(o)
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ref1 = weakref.ref(o)
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ref2 = weakref.ref(o)
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self.assert_(ref1 is ref2,
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"reference object w/out callback should be re-used")
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self.assert_(weakref.getweakrefcount(o) == 2,
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"wrong weak ref count for object")
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del proxy
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self.assert_(weakref.getweakrefcount(o) == 1,
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"wrong weak ref count for object after deleting proxy")
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def test_proxy_reuse(self):
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o = C()
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proxy1 = weakref.proxy(o)
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ref = weakref.ref(o)
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proxy2 = weakref.proxy(o)
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self.assert_(proxy1 is proxy2,
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"proxy object w/out callback should have been re-used")
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def test_basic_proxy(self):
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o = C()
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self.check_proxy(o, weakref.proxy(o))
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def test_callable_proxy(self):
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o = Callable()
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ref1 = weakref.proxy(o)
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self.check_proxy(o, ref1)
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self.assert_(type(ref1) is weakref.CallableProxyType,
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"proxy is not of callable type")
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ref1('twinkies!')
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self.assert_(o.bar == 'twinkies!',
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"call through proxy not passed through to original")
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# expect due to too few args
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self.assertRaises(TypeError, ref1)
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# expect due to too many args
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self.assertRaises(TypeError, ref1, 1, 2, 3)
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def check_proxy(self, o, proxy):
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o.foo = 1
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self.assert_(proxy.foo == 1,
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"proxy does not reflect attribute addition")
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o.foo = 2
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self.assert_(proxy.foo == 2,
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"proxy does not reflect attribute modification")
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del o.foo
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self.assert_(not hasattr(proxy, 'foo'),
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"proxy does not reflect attribute removal")
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proxy.foo = 1
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self.assert_(o.foo == 1,
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"object does not reflect attribute addition via proxy")
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proxy.foo = 2
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self.assert_(
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o.foo == 2,
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"object does not reflect attribute modification via proxy")
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del proxy.foo
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self.assert_(not hasattr(o, 'foo'),
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"object does not reflect attribute removal via proxy")
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def test_getweakrefcount(self):
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o = C()
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ref1 = weakref.ref(o)
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ref2 = weakref.ref(o, self.callback)
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self.assert_(weakref.getweakrefcount(o) == 2,
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"got wrong number of weak reference objects")
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proxy1 = weakref.proxy(o)
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proxy2 = weakref.proxy(o, self.callback)
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self.assert_(weakref.getweakrefcount(o) == 4,
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"got wrong number of weak reference objects")
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def test_getweakrefs(self):
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o = C()
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ref1 = weakref.ref(o, self.callback)
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ref2 = weakref.ref(o, self.callback)
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del ref1
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self.assert_(weakref.getweakrefs(o) == [ref2],
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"list of refs does not match")
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o = C()
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ref1 = weakref.ref(o, self.callback)
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ref2 = weakref.ref(o, self.callback)
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del ref2
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self.assert_(weakref.getweakrefs(o) == [ref1],
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"list of refs does not match")
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class Object:
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def __init__(self, arg):
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self.arg = arg
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def __repr__(self):
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return "<Object %r>" % self.arg
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class MappingTestCase(TestBase):
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COUNT = 10
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def test_weak_values(self):
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dict = weakref.WeakValueDictionary()
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objects = map(Object, range(self.COUNT))
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for o in objects:
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dict[o.arg] = o
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for o in objects:
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self.assert_(weakref.getweakrefcount(o) == 1,
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"wrong number of weak references to %r!" % o)
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self.assert_(o is dict[o.arg],
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"wrong object returned by weak dict!")
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items1 = dict.items()
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items2 = dict.copy().items()
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items1.sort()
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items2.sort()
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self.assert_(items1 == items2,
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"cloning of weak-valued dictionary did not work!")
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del items1, items2
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self.assert_(len(dict) == self.COUNT)
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del objects[0]
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self.assert_(len(dict) == (self.COUNT - 1),
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"deleting object did not cause dictionary update")
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del objects, o
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self.assert_(len(dict) == 0,
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"deleting the values did not clear the dictionary")
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def test_weak_keys(self):
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dict = weakref.WeakKeyDictionary()
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objects = map(Object, range(self.COUNT))
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for o in objects:
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dict[o] = o.arg
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for o in objects:
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self.assert_(weakref.getweakrefcount(o) == 1,
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"wrong number of weak references to %r!" % o)
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self.assert_(o.arg is dict[o],
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"wrong object returned by weak dict!")
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items1 = dict.items()
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items2 = dict.copy().items()
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items1.sort()
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items2.sort()
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self.assert_(items1 == items2,
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"cloning of weak-keyed dictionary did not work!")
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del items1, items2
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self.assert_(len(dict) == self.COUNT)
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del objects[0]
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self.assert_(len(dict) == (self.COUNT - 1),
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"deleting object did not cause dictionary update")
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del objects, o
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self.assert_(len(dict) == 0,
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"deleting the keys did not clear the dictionary")
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run_unittest(ReferencesTestCase)
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run_unittest(MappingTestCase)
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