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test_abc.py

#!/usr/bin/env python
"""
test dill's ability to pickle abstract base class objects
"""
import dill
import abc
from abc import ABC
import warnings

from types import FunctionType

dill.settings['recurse'] = True

class OneTwoThree(ABC):
    @abc.abstractmethod
    def foo(self):
        """A method"""
        pass

@property
    @abc.abstractmethod
    def bar(self):
        """Property getter"""
        pass

@bar.setter
    @abc.abstractmethod
    def bar(self, value):
        """Property setter"""
        pass

@classmethod
    @abc.abstractmethod
    def cfoo(cls):
        """Class method"""
        pass

@staticmethod
    @abc.abstractmethod
    def sfoo():
        """Static method"""
        pass

class EasyAsAbc(OneTwoThree):
    def __init__(self):
        self._bar = None

def foo(self):
        return "Instance Method FOO"

@property
    def bar(self):
        return self._bar

@bar.setter
    def bar(self, value):
        self._bar = value

@classmethod
    def cfoo(cls):
        return "Class Method CFOO"

@staticmethod
    def sfoo():
        return "Static Method SFOO"

def test_abc_non_local():
    assert dill.copy(OneTwoThree) is not OneTwoThree
    assert dill.copy(EasyAsAbc) is not EasyAsAbc

with warnings.catch_warnings():
        warnings.simplefilter("ignore", dill.PicklingWarning)
        assert dill.copy(OneTwoThree, byref=True) is OneTwoThree
        assert dill.copy(EasyAsAbc, byref=True) is EasyAsAbc

instance = EasyAsAbc()
    # Set a property that StockPickle can't preserve
    instance.bar = lambda x: x**2
    depickled = dill.copy(instance)
    assert type(depickled) is not type(instance)
    assert type(depickled.bar) is FunctionType
    assert depickled.bar(3) == 9
    assert depickled.sfoo() == "Static Method SFOO"
    assert depickled.cfoo() == "Class Method CFOO"
    assert depickled.foo() == "Instance Method FOO"

def test_abc_local():
    """
    Test using locally scoped ABC class
    """
    class LocalABC(ABC):
        @abc.abstractmethod
        def foo(self):
            pass

def baz(self):
            return repr(self)

labc = dill.copy(LocalABC)
    assert labc is not LocalABC
    assert type(labc) is type(LocalABC)
    # TODO should work like it does for non local classes
    # <class '__main__.LocalABC'>
    # <class '__main__.test_abc_local.<locals>.LocalABC'>

class Real(labc):
        def foo(self):
            return "True!"

def baz(self):
            return "My " + super(Real, self).baz()

real = Real()
    assert real.foo() == "True!"

try:
        labc()
    except TypeError as e:
        # Expected error
        pass
    else:
        print('Failed to raise type error')
        assert False

labc2, pik = dill.copy((labc, Real()))
    assert 'Real' == type(pik).__name__
    assert '.Real' in type(pik).__qualname__
    assert type(pik) is not Real
    assert labc2 is not LocalABC
    assert labc2 is not labc
    assert isinstance(pik, labc2)
    assert not isinstance(pik, labc)
    assert not isinstance(pik, LocalABC)
    assert pik.baz() == "My " + repr(pik)

def test_meta_local_no_cache():
    """
    Test calling metaclass and cache registration
    """
    LocalMetaABC = abc.ABCMeta('LocalMetaABC', (), {})

class ClassyClass:
        pass

class KlassyClass:
      pass

LocalMetaABC.register(ClassyClass)

assert not issubclass(KlassyClass, LocalMetaABC)
    assert issubclass(ClassyClass, LocalMetaABC)

res = dill.dumps((LocalMetaABC, ClassyClass, KlassyClass))

lmabc, cc, kc = dill.loads(res)
    assert type(lmabc) == type(LocalMetaABC)
    assert not issubclass(kc, lmabc)
    assert issubclass(cc, lmabc)

if __name__ == '__main__':
    test_abc_non_local()
    test_abc_local()
    test_meta_local_no_cache()

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