Synnefo

#!/usr/bin/env python

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# -*- coding: utf-8 -*-

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"""Unit Tests for the Singleton classes in synnefo.lib.singleton

Provides unit tests for the code implementing Singleton

classes in the synnefo.lib.singleton module.

"""

import unittest

from synnefo.lib.singleton import ArgBasedSingleton, ArgBasedSingletonMeta

class SubClassOne(ArgBasedSingleton):

    name = None

    def __init__(self, name):

        self.name = name

class SubClassTwo(ArgBasedSingleton):

    name = None

    def __init__(self, name):

        self.name = name

class SubClassThree(SubClassTwo):

    name2 = None

    def __init__(self, name):

        self.name2 = name

class SubClassKwArgs(ArgBasedSingleton):

    name = None

    def __init__(self, onearg, **kwargs):

        self.name = onearg

        for x in kwargs:

            setattr(self, x, kwargs[x])

class SubClassNoReinit(ArgBasedSingleton):

    initialized = None

    def __init__(self, *args, **kwargs):

        if self.initialized:

            raise Exception("__init__ called twice!")

        self.initialized = True

class ArgBasedSingletonTestCase(unittest.TestCase):

    def test_same_object(self):

        o1 = ArgBasedSingleton()

        o2 = ArgBasedSingleton()

        self.assertTrue(o1 is o2)

class MyMeta(ArgBasedSingletonMeta):

    def __call__(cls, *args, **kw):

        return super(MyMeta, cls).__call__(*args, **kw)

class BaseClass(object):

    __metaclass__ = MyMeta

    def ret5(self):

        return 5

class SubClassMultiple(BaseClass, ArgBasedSingleton):

    name = None

    def __init__(self, name):

        name = name

class SubClassTestCase(unittest.TestCase):

    def test_same_object(self):

        o1 = SubClassOne('one')

        o2 = SubClassOne('two')

        o1a = SubClassOne('one')

        self.assertEqual(o1.name, 'one')

        self.assertEqual(o2.name, 'two')

        self.assertEqual(o1a.name, 'one')

        self.assertFalse(o1 is o2)

        self.assertTrue(o1 is o1a)

    def test_different_classes(self):

        o1 = SubClassOne('one')

        o2 = SubClassTwo('one')

        self.assertEqual(o1.name, 'one')

        self.assertEqual(o2.name, 'one')

        self.assertFalse(o1 is o2)

class SubClassKwArgsTestCase(unittest.TestCase):

    def test_init_signature(self):

        self.assertRaises(TypeError, SubClassKwArgs, 'one', 'two')

    def test_distinct_kwargs(self):

        o1 = SubClassKwArgs('one', a=1)

        o2 = SubClassKwArgs('two')

        o1a = SubClassKwArgs('one', a=2)

        o1b = SubClassKwArgs('one', a=1)

        o1c = SubClassKwArgs('one', a=1, b=2)

        o1d = SubClassKwArgs('one', b=2, a=1)

        self.assertEqual(o1.a, 1)

        self.assertEqual(o1a.a, 2)

        self.assertEqual(o1b.a, 1)

        self.assertRaises(AttributeError, getattr, o2, 'a')

        self.assertFalse(o1 is o2)

        self.assertFalse(o1 is o1a)

        self.assertTrue(o1 is o1b)

        self.assertTrue(o1c is o1d)

class SubClassDistinctDicts(unittest.TestCase):

    def test_distinct_storage_per_subclass(self):

        o1 = SubClassOne('one')

        o2 = SubClassTwo('one')

        o1a = SubClassOne('two')

        o2a = SubClassTwo('two')

        self.assertEqual(o1.name, 'one')

        self.assertEqual(o2.name, 'one')

        self.assertEqual(o1a.name, 'two')

        self.assertEqual(o2a.name, 'two')

        self.assertTrue(o1._singles is o1a._singles)

        self.assertTrue(o2._singles is o2a._singles)

        self.assertFalse(o1._singles is o2._singles)

        self.assertFalse(o1a._singles is o2a._singles)

class SubClassThreeTestCase(unittest.TestCase):

    def test_singleton_inheritance(self):

        o1 = SubClassThree('one')

        o2 = SubClassThree('two')

        o1a = SubClassThree('one')

        self.assertEquals(o1.name2, 'one')

        self.assertEquals(o2.name2, 'two')

        self.assertEquals(o1a.name2, 'one')

        self.assertTrue(o1 is o1a)

        self.assertFalse(o1 is o2)

class SubClassMultipleTestCase(unittest.TestCase):

    def test_multiple_inheritance(self):

        o1 = SubClassMultiple('one')

        o2 = SubClassMultiple('two')

        o1a = SubClassMultiple('one')

        self.assertEquals(o1.ret5(), 5)

        self.assertEquals(o2.ret5(), 5)

        self.assertEquals(o1a.ret5(), 5)

        self.assertTrue(o1 is o1a)

        self.assertFalse(o1 is o2)

class SubClassNoReinitTestCase(unittest.TestCase):

    def test_no_reinit(self):

        o1 = SubClassNoReinit('one')

        o2 = SubClassNoReinit('one')

        self.assertTrue(o1 is o2)

if __name__ == '__main__':

    unittest.main()