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# ==================================================================================================================== #
# _____ _ _ __ __ _ ____ _ #
# _ __ _ |_ _|__ ___ | (_)_ __ __ _ | \/ | ___| |_ __ _ / ___| | __ _ ___ ___ ___ ___ #
# | '_ \| | | || |/ _ \ / _ \| | | '_ \ / _` | | |\/| |/ _ \ __/ _` | | | |/ _` / __/ __|/ _ \/ __| #
# | |_) | |_| || | (_) | (_) | | | | | | (_| |_| | | | __/ || (_| | |___| | (_| \__ \__ \ __/\__ \ #
# | .__/ \__, ||_|\___/ \___/|_|_|_| |_|\__, (_)_| |_|\___|\__\__,_|\____|_|\__,_|___/___/\___||___/ #
# |_| |___/ |___/ #
# ==================================================================================================================== #
# Authors: #
# Patrick Lehmann #
# #
# License: #
# ==================================================================================================================== #
# Copyright 2017-2025 Patrick Lehmann - Bötzingen, Germany #
# #
# Licensed under the Apache License, Version 2.0 (the "License"); #
# you may not use this file except in compliance with the License. #
# You may obtain a copy of the License at #
# #
# http://www.apache.org/licenses/LICENSE-2.0 #
# #
# Unless required by applicable law or agreed to in writing, software #
# distributed under the License is distributed on an "AS IS" BASIS, #
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. #
# See the License for the specific language governing permissions and #
# limitations under the License. #
# #
# SPDX-License-Identifier: Apache-2.0 #
# ==================================================================================================================== #
#
"""
Unit tests for class :class:`pyTooling.MetaClasses.Singleton`.
"""
from unittest import TestCase
from pytest import mark
from pyTooling.MetaClasses import ExtendedType
if __name__ == "__main__": # pragma: no cover
print("ERROR: you called a testcase declaration file as an executable module.")
print("Use: 'python -m unittest <testcase module>'")
exit(1)
class App1WithoutParameters(metaclass=ExtendedType, singleton=True):
X = 10
def __init__(self) -> None:
print("Instance of 'App1WithoutParameters' was created")
self.X = 11
class App2WithoutParameters(metaclass=ExtendedType, singleton=True):
X = 20
def __init__(self) -> None:
print("Instance of 'App2WithoutParameters' was created")
self.X = 21
class App3WithParameters(metaclass=ExtendedType, singleton=True):
X = 30
def __init__(self, x: int = 31) -> None:
print("Instance of 'App1WithParameters' was created")
self.X = x
class DerivedApp2WithoutParameters(App2WithoutParameters):
X = 120
def __init__(self) -> None:
super().__init__()
print("Instance of 'DerivedApp2WithoutParameters' was created")
class DerivedApp3WithInnerParameters(App3WithParameters):
X = 130
def __init__(self) -> None:
super().__init__(x=131)
print("Instance of 'DerivedApp3WithInnerParameters' was created")
class DerivedApp3WithOuterParameters(App3WithParameters):
X = 135
def __init__(self, x: int = 136) -> None:
super().__init__(x)
print("Instance of 'DerivedApp3WithOuterParameters' was created")
class Singleton(TestCase):
def test_CrossRelations(self) -> None:
self.assertEqual(10, App1WithoutParameters.X)
self.assertEqual(20, App2WithoutParameters.X)
app_1 = App1WithoutParameters()
self.assertEqual(11, app_1.X)
app_1.X = 12
self.assertEqual(12, app_1.X)
app_1same = App1WithoutParameters()
self.assertIs(app_1, app_1same)
self.assertEqual(12, app_1same.X)
self.assertEqual(10, App1WithoutParameters.X)
app_2 = App2WithoutParameters()
self.assertIsNot(app_1, app_2)
self.assertEqual(12, app_1.X)
self.assertEqual(21, app_2.X)
app_2.X = 22
self.assertEqual(12, app_1.X)
self.assertEqual(22, app_2.X)
def test_SecondInstanceWithParameters(self) -> None:
# ensure at least one instance was created
App1WithoutParameters()
with self.assertRaises(ValueError) as ExceptionCapture:
App1WithoutParameters(x = 35)
self.assertEqual("A further instance of a singleton can't be reinitialized with parameters.", str(ExceptionCapture.exception))
def test_DerivedClassNoParameters(self) -> None:
self.assertEqual(120, DerivedApp2WithoutParameters.X)
app = DerivedApp2WithoutParameters()
self.assertEqual(21, app.X)
app.X = 22
self.assertEqual(22, app.X)
app2 = DerivedApp2WithoutParameters()
self.assertIs(app, app2)
self.assertEqual(22, app2.X)
self.assertEqual(120, DerivedApp2WithoutParameters.X)
def test_DerivedClassWithInnerParameters(self) -> None:
app = DerivedApp3WithInnerParameters()
self.assertEqual(131, app.X)
appSame = DerivedApp3WithInnerParameters()
self.assertIs(app, appSame)
@mark.xfail(reason="This case is not yet supported.")
def test_DerivedClassWithOuterParameters(self) -> None:
app = DerivedApp3WithOuterParameters(x=137)
self.assertEqual(137, app.X)
appSame = DerivedApp3WithOuterParameters()
self.assertIs(app, appSame)
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