Lib/test/test_cpickle.py

import cPickle, unittest
from cStringIO import StringIO
from test.pickletester import (AbstractPickleTests,
                               AbstractPickleModuleTests,
                               AbstractPicklerUnpicklerObjectTests,
                               BigmemPickleTests)
from test import test_support

class cPickleTests(AbstractPickleTests, AbstractPickleModuleTests):

    def setUp(self):
        self.dumps = cPickle.dumps
        self.loads = cPickle.loads

    error = cPickle.BadPickleGet
    module = cPickle

class cPicklePicklerTests(AbstractPickleTests):

    def dumps(self, arg, proto=0):
        f = StringIO()
        p = cPickle.Pickler(f, proto)
        p.dump(arg)
        f.seek(0)
        return f.read()

    def loads(self, buf):
        f = StringIO(buf)
        p = cPickle.Unpickler(f)
        return p.load()

    error = cPickle.BadPickleGet

class cPickleListPicklerTests(AbstractPickleTests):

    def dumps(self, arg, proto=0):
        p = cPickle.Pickler(proto)
        p.dump(arg)
        return p.getvalue()

    def loads(self, *args):
        f = StringIO(args[0])
        p = cPickle.Unpickler(f)
        return p.load()

    error = cPickle.BadPickleGet

class cPickleFastPicklerTests(AbstractPickleTests):

    def dumps(self, arg, proto=0):
        f = StringIO()
        p = cPickle.Pickler(f, proto)
        p.fast = 1
        p.dump(arg)
        f.seek(0)
        return f.read()

    def loads(self, *args):
        f = StringIO(args[0])
        p = cPickle.Unpickler(f)
        return p.load()

    error = cPickle.BadPickleGet

    def test_recursive_list(self):
        self.assertRaises(ValueError,
                          AbstractPickleTests.test_recursive_list,
                          self)

    def test_recursive_tuple(self):
        self.assertRaises(ValueError,
                          AbstractPickleTests.test_recursive_tuple,
                          self)

    def test_recursive_inst(self):
        self.assertRaises(ValueError,
                          AbstractPickleTests.test_recursive_inst,
                          self)

    def test_recursive_dict(self):
        self.assertRaises(ValueError,
                          AbstractPickleTests.test_recursive_dict,
                          self)

    def test_recursive_multi(self):
        self.assertRaises(ValueError,
                          AbstractPickleTests.test_recursive_multi,
                          self)

    def test_nonrecursive_deep(self):
        # If it's not cyclic, it should pickle OK even if the nesting
        # depth exceeds PY_CPICKLE_FAST_LIMIT.  That happens to be
        # 50 today.  Jack Jansen reported stack overflow on Mac OS 9
        # at 64.
        a = []
        for i in range(60):
            a = [a]
        b = self.loads(self.dumps(a))
        self.assertEqual(a, b)

class cPicklePicklerUnpicklerObjectTests(AbstractPicklerUnpicklerObjectTests):

    pickler_class = cPickle.Pickler
    unpickler_class = cPickle.Unpickler

class cPickleBigmemPickleTests(BigmemPickleTests):

    def dumps(self, arg, proto=0, fast=0):
        # Ignore fast
        return cPickle.dumps(arg, proto)

    def loads(self, buf):
        # Ignore fast
        return cPickle.loads(buf)


class Node(object):
    pass

class cPickleDeepRecursive(unittest.TestCase):
    def test_issue2702(self):
        # This should raise a RecursionLimit but in some
        # platforms (FreeBSD, win32) sometimes raises KeyError instead,
        # or just silently terminates the interpreter (=crashes).
        nodes = [Node() for i in range(500)]
        for n in nodes:
            n.connections = list(nodes)
            n.connections.remove(n)
        self.assertRaises((AttributeError, RuntimeError), cPickle.dumps, n)

    def test_issue3179(self):
        # Safe test, because I broke this case when fixing the
        # behaviour for the previous test.
        res=[]
        for x in range(1,2000):
            res.append(dict(doc=x, similar=[]))
        cPickle.dumps(res)


def test_main():
    test_support.run_unittest(
        cPickleTests,
        cPicklePicklerTests,
        cPickleListPicklerTests,
        cPickleFastPicklerTests,
        cPickleDeepRecursive,
        cPicklePicklerUnpicklerObjectTests,
        cPickleBigmemPickleTests,
    )

if __name__ == "__main__":
    test_main()