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import py
class AppTestIdentitySet(object):
def setup_class(cls):
from pypy.objspace.std import identitydict
if cls.runappdirect:
py.test.skip("interp2app doesn't work on appdirect")
def w_uses_strategy(self, s , obj):
import __pypy__
return s in __pypy__.internal_repr(obj)
def test_use_identity_strategy(self):
class Plain(object):
pass
class CustomEq(object):
def __eq__(self, other):
return True
__hash__ = object.__hash__
class CustomHash(object):
def __hash__(self):
return 0
s = set()
assert not self.uses_strategy('IdentitySetStrategy',s)
s.add(Plain())
assert self.uses_strategy('IdentitySetStrategy',s)
for cls in [CustomEq,CustomHash]:
s = set()
s.add(cls())
assert not self.uses_strategy('IdentitySetStrategy',s)
def test_use_identity_strategy_list(self):
class X(object):
pass
assert self.uses_strategy('IdentitySetStrategy',set([X(),X()]))
assert not self.uses_strategy('IdentitySetStrategy',set([X(),""]))
assert not self.uses_strategy('IdentitySetStrategy',set([X(),""]))
assert not self.uses_strategy('IdentitySetStrategy',set([X(),1]))
def test_identity_strategy_add(self):
class X(object):
pass
class NotIdent(object):
def __eq__(self,other):
pass
__hash__ = object.__hash__
s = set([X(),X()])
s.add('foo')
assert not self.uses_strategy('IdentitySetStrategy',s)
s = set([X(),X()])
s.add(NotIdent())
assert not self.uses_strategy('IdentitySetStrategy',s)
def test_identity_strategy_sanity(self):
class X(object):
pass
class Y(object):
pass
a,b,c,d,e,f = X(),Y(),X(),Y(),X(),Y()
s = set([a,b]).union(set([c]))
assert self.uses_strategy('IdentitySetStrategy',s)
assert set([a,b,c]) == s
s = set([a,b,c,d,e,f]) - set([d,e,f])
assert self.uses_strategy('IdentitySetStrategy',s)
assert set([a,b,c]) == s
s = set([a])
s.update([b,c])
assert s == set([a,b,c])
def test_identity_strategy_iterators(self):
class X(object):
pass
s = set([X() for i in range(10)])
counter = 0
for item in s:
counter += 1
assert item in s
assert counter == 10
def test_identity_strategy_other_cmp(self):
# test tries to hit positive and negative in
# may_contain_equal_elements
class X(object):
pass
s = set([X() for i in range(10)])
assert s.intersection(set([1,2,3])) == set()
assert s.intersection(set(['a','b','c'])) == set()
assert s.intersection(set(['a','b','c'])) == set()
assert s.intersection(set([X(),X()])) == set()
other = set(['a','b','c',next(s.__iter__())])
intersect = s.intersection(other)
assert len(intersect) == 1
assert next(intersect.__iter__()) in s
assert next(intersect.__iter__()) in other
def test_class_monkey_patch(self):
class X(object):
pass
s = set()
s.add(X())
assert self.uses_strategy('IdentitySetStrategy',s)
X.__eq__ = lambda self,other : None
s.add(X())
assert not self.uses_strategy('IdentitySetStrategy',s)
assert not self.uses_strategy('IdentitySetStrategy',set([X(),X()]))
assert not self.uses_strategy('IdentitySetStrategy',set([X(),""]))
assert not self.uses_strategy('IdentitySetStrategy',set([X(),""]))
assert not self.uses_strategy('IdentitySetStrategy',set([X(),1]))
# An interesting case, add an instance, mutate the class,
# then add the same instance.
class X(object):
pass
s = set()
inst = X()
s.add(inst)
X.__eq__ = lambda x,y : x is y
s.add(inst)
assert len(s) == 1
assert next(s.__iter__()) is inst
assert not self.uses_strategy('IdentitySetStrategy',s)
# Add instance, mutate class, check membership of that instance.
class X(object):
pass
inst = X()
s = set()
s.add(inst)
X.__eq__ = lambda x,y : x is y
assert inst in s
# Test Wrong strategy
# If the strategy is changed by mutation, but the instance
# does not change, then this tests the methods that call
# may_contain_equal_elements still function.
# i.e. same instance in two sets, one with object strategy, one with
# identity strategy.
class X(object):
pass
inst = X()
s1 = set()
s1.add(inst)
assert self.uses_strategy('IdentitySetStrategy',s1)
X.__eq__ = lambda x,y : x is y
s2 = set()
s2.add(inst)
assert not self.uses_strategy('IdentitySetStrategy',s2)
assert s1.intersection(s2) == set([inst])
assert (s1 - s2) == set()
assert (s2 - s1) == set()
s1.difference_update(s2)
assert s1 == set()
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