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# (C) Copyright 2005-2023 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!
""" Test the persistence behavior of TraitListObjects, TraitDictObjects and
TraitSetObjects.
"""
import copy
import pickle
import unittest
from traits.has_traits import HasTraits, on_trait_change
from traits.trait_types import Dict, List, Set, Str, Int, Instance
class A(HasTraits):
alist = List(Int, list(range(5)))
adict = Dict(Str, Int, dict(a=1, b=2))
aset = Set(Int, set(range(5)))
events = List()
@on_trait_change("alist_items,adict_items,aset_items")
def _receive_events(self, object, name, old, new):
self.events.append((name, new))
class B(HasTraits):
dict = Dict(Str, Instance(A))
class TestTraitListDictSetPersistence(unittest.TestCase):
def test_trait_list_object_persists(self):
a = A()
list = pickle.loads(pickle.dumps(a.alist))
self.assertIsNone(list.object())
list.append(10)
self.assertEqual(len(a.events), 0)
a.alist.append(20)
self.assertEqual(len(a.events), 1)
list2 = pickle.loads(pickle.dumps(list))
self.assertIsNone(list2.object())
def test_trait_dict_object_persists(self):
a = A()
dict = pickle.loads(pickle.dumps(a.adict))
self.assertIsNone(dict.object())
dict["key"] = 10
self.assertEqual(len(a.events), 0)
a.adict["key"] = 10
self.assertEqual(len(a.events), 1)
dict2 = pickle.loads(pickle.dumps(dict))
self.assertIsNone(dict2.object())
def test_trait_set_object_persists(self):
a = A()
set = pickle.loads(pickle.dumps(a.aset))
self.assertIsNone(set.object())
set.add(10)
self.assertEqual(len(a.events), 0)
a.aset.add(20)
self.assertEqual(len(a.events), 1)
set2 = pickle.loads(pickle.dumps(set))
self.assertIsNone(set2.object())
def test_trait_list_object_copies(self):
a = A()
list = copy.deepcopy(a.alist)
self.assertIsNone(list.object())
list.append(10)
self.assertEqual(len(a.events), 0)
a.alist.append(20)
self.assertEqual(len(a.events), 1)
list2 = copy.deepcopy(list)
list2.append(30)
self.assertIsNone(list2.object())
def test_trait_dict_object_copies(self):
a = A()
dict = copy.deepcopy(a.adict)
self.assertIsNone(dict.object())
dict["key"] = 10
self.assertEqual(len(a.events), 0)
a.adict["key"] = 10
self.assertEqual(len(a.events), 1)
dict2 = copy.deepcopy(dict)
dict2["key2"] = 20
self.assertIsNone(dict2.object())
def test_trait_set_object_copies(self):
a = A()
set1 = copy.deepcopy(a.aset)
self.assertIsNone(set1.object())
set1.add(10)
self.assertEqual(len(a.events), 0)
a.aset.add(20)
self.assertEqual(len(a.events), 1)
set2 = copy.deepcopy(set1)
set2.add(30)
self.assertIsNone(set2.object())
set3 = a.aset.copy()
self.assertIs(type(set3), set)
# Should not raise an AttributeError:
set3.remove(20)
def test_pickle_whole(self):
a = A()
pickle.loads(pickle.dumps(a))
b = B(dict=dict(a=a))
pickle.loads(pickle.dumps(b))
def test_trait_set_object_operations(self):
# Regression test for update methods not coercing in the same way as
# standard set objects (github issue #288)
a = A()
a.aset.update({10: "a"})
self.assertEqual(a.aset, set([0, 1, 2, 3, 4, 10]))
a.aset.intersection_update({3: "b", 4: "b", 10: "a", 11: "b"})
self.assertEqual(a.aset, set([3, 4, 10]))
a.aset.difference_update({10: "a", 11: "b"})
self.assertEqual(a.aset, set([3, 4]))
a.aset.symmetric_difference_update({10: "a", 4: "b"})
self.assertEqual(a.aset, set([3, 10]))
def test_trait_set_object_inplace(self):
a = A()
a.aset |= set([10])
self.assertEqual(a.aset, set([0, 1, 2, 3, 4, 10]))
a.aset &= set([3, 4, 10, 11])
self.assertEqual(a.aset, set([3, 4, 10]))
a.aset -= set([10, 11])
self.assertEqual(a.aset, set([3, 4]))
a.aset ^= set([10, 4])
self.assertEqual(a.aset, set([3, 10]))
def test_trait_list_default_kind(self):
a = A()
list_trait = a.traits()["alist"]
self.assertEqual(list_trait.default_kind, "list")
def test_trait_dict_default_kind(self):
a = A()
dict_trait = a.traits()["adict"]
self.assertEqual(dict_trait.default_kind, "dict")
def test_trait_set_default_kind(self):
a = A()
set_trait = a.traits()["aset"]
self.assertEqual(set_trait.default_kind, "set")
def test_trait_list_default(self):
a = A()
list_trait = a.traits()["alist"]
self.assertEqual(list_trait.default, [0, 1, 2, 3, 4])
# The default property should have returned a copy, so
# modifying it doesn't change the actual default.
list_trait.default.append(5)
self.assertEqual(a.alist, [0, 1, 2, 3, 4])
def test_trait_dict_default(self):
a = A()
dict_trait = a.traits()["adict"]
self.assertEqual(dict_trait.default, {"a": 1, "b": 2})
# The default property should have returned a copy, so
# modifying it doesn't change the actual default.
dict_trait.default.pop("a")
self.assertEqual(a.adict, {"a": 1, "b": 2})
def test_trait_set_default(self):
a = A()
set_trait = a.traits()["aset"]
self.assertEqual(set_trait.default, {0, 1, 2, 3, 4})
# The default property should have returned a copy, so
# modifying it doesn't change the actual default.
set_trait.default.remove(2)
self.assertEqual(a.aset, {0, 1, 2, 3, 4})
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