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'''
Task Coach - Your friendly task manager
Copyright (C) 2004-2014 Task Coach developers <developers@taskcoach.org>
Task Coach is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Task Coach is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
'''
import test
from taskcoachlib import patterns
class Numbered(object):
__metaclass__ = patterns.NumberedInstances
def __init__(self, instanceNumber=-1):
self.instanceNumber = instanceNumber
class SubclassOfNumbered(Numbered):
pass
class NumberedInstancesTestsMixin(object):
''' The tests below should work for a class with NumberedInstances as
metaclass as well as for a subclass of a class with NumberedInstances
as metaclass. '''
def testCounterIncreasesAfterEachInstantation(self):
instances = []
for count in range(3):
instance = self.classUnderTest()
self.assertEqual(count, instance.instanceNumber)
instances.append(instance)
def testInstanceNumbersAreReusedWhenFreed(self):
instance1 = self.classUnderTest()
del instance1
instance2 = self.classUnderTest()
self.assertEqual(0, instance2.instanceNumber)
def testInstanceNumbersAreTheLowestFreeNumber(self):
instance1 = self.classUnderTest()
instance2 = self.classUnderTest()
instance2Number = instance2.instanceNumber
del instance2
instance3 = self.classUnderTest()
self.assertEqual(instance3.instanceNumber, instance2Number)
def testInstanceNumbersFillTheGap(self):
instances = []
for count in range(10):
instances.append(self.classUnderTest())
del instances[4:6]
instance4 = self.classUnderTest()
self.assertEqual(4, instance4.instanceNumber)
instance5 = self.classUnderTest()
self.assertEqual(5, instance5.instanceNumber)
instance10 = self.classUnderTest()
self.assertEqual(10, instance10.instanceNumber)
class NumberedInstancesTest(NumberedInstancesTestsMixin,
test.TestCase):
classUnderTest = Numbered
class SubclassOfNumberedInstancesTest(NumberedInstancesTestsMixin,
test.TestCase):
classUnderTest = SubclassOfNumbered
def testSubclassInstancesHaveTheirOwnNumbers(self):
numberedInstance = Numbered()
subclassOfNumberedInstance = SubclassOfNumbered()
self.assertEqual(0, numberedInstance.instanceNumber)
self.assertEqual(0, subclassOfNumberedInstance.instanceNumber)
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