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# (C) Copyright 2005-2025 Enthought, Inc., Austin, TX
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in LICENSE.txt and may be redistributed only under
# the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!
""" Tests the class mapping functionality of the enthought.pickle
framework.
"""
# Standard library imports.
import io
import pickle
import unittest
# Enthought library imports
from apptools.persistence.versioned_unpickler import VersionedUnpickler
from apptools.persistence.updater import Updater
##############################################################################
# Classes to use within the tests
##############################################################################
class Foo:
pass
class Bar:
pass
class Baz:
pass
##############################################################################
# class 'ClassMappingTestCase'
##############################################################################
class ClassMappingTestCase(unittest.TestCase):
"""Originally tests for the class mapping functionality of the now deleted
apptools.sweet_pickle framework, converted to use apptools.persistence.
"""
##########################################################################
# 'TestCase' interface
##########################################################################
### public interface #####################################################
def test_unpickled_class_mapping(self):
class TestUpdater(Updater):
def __init__(self):
self.refactorings = {
(Foo.__module__, Foo.__name__):
(Bar.__module__, Bar.__name__),
(Bar.__module__, Bar.__name__):
(Baz.__module__, Baz.__name__),
}
self.setstates = {}
# Validate that unpickling the first class gives us an instance of
# the second class.
start = Foo()
test_file = io.BytesIO(pickle.dumps(start, 2))
end = VersionedUnpickler(test_file, updater=TestUpdater()).load()
self.assertIsInstance(end, Bar)
# Validate that unpickling the second class gives us an instance of
# the third class.
start = Bar()
test_file = io.BytesIO(pickle.dumps(start, 2))
end = VersionedUnpickler(test_file, updater=TestUpdater()).load()
self.assertIsInstance(end, Baz)
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