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# SPDX-FileCopyrightText: © 2024 Christian BUHTZ <c.buhtz@posteo.jp>
#
# SPDX-License-Identifier: GPL-2.0-or-later
#
# This file is part of the program "Back In time" which is released under GNU
# General Public License v2 (GPLv2).
# See file LICENSE or go to <https://www.gnu.org/licenses/#GPL>.
"""Tests about singleton module."""
# pylint: disable=missing-class-docstring,too-few-public-methods
import unittest
import singleton
class Test(unittest.TestCase):
class Foo(metaclass=singleton.Singleton):
def __init__(self):
self.value = 'Ogawa'
class Bar(metaclass=singleton.Singleton):
def __init__(self):
self.value = 'Naomi'
def setUp(self):
# Clean up all instances
singleton.Singleton._instances = {} # pylint: disable=protected-access
def test_twins(self):
"""Identical id and values."""
a = self.Foo()
b = self.Foo()
self.assertEqual(id(a), id(b))
self.assertEqual(a.value, b.value)
def test_share_value(self):
"""Modify value"""
a = self.Foo()
b = self.Foo()
a.value = 'foobar'
self.assertEqual(a.value, 'foobar')
self.assertEqual(a.value, b.value)
def test_multi_class(self):
"""Two different singleton classes."""
a = self.Foo()
b = self.Foo()
x = self.Bar()
y = self.Bar()
self.assertEqual(id(a), id(b))
self.assertEqual(id(x), id(y))
self.assertNotEqual(id(a), id(y))
self.assertEqual(a.value, 'Ogawa')
self.assertEqual(x.value, 'Naomi')
a.value = 'who'
self.assertEqual(b.value, 'who')
self.assertEqual(x.value, 'Naomi')
self.assertEqual(x.value, y.value)
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