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# From https://github.com/reyoung/singleton
import unittest
from graphite.singleton import Singleton, ThreadSafeSingleton
class TestSingleton(unittest.TestCase):
def _test_singleton(self, cls):
@cls
class IntSingleton(object):
def __init__(self, default=0):
self.i = default
IntSingleton.initialize(10)
a = IntSingleton.instance()
b = IntSingleton.instance()
self.assertEqual(a, b)
self.assertEqual(id(a), id(b))
self.assertTrue(IntSingleton.is_initialized())
self.assertEqual(a.i, 10)
self.assertEqual(b.i, 10)
a.i = 100
self.assertEqual(b.i, 100)
def test_singleton(self):
self._test_singleton(Singleton)
def test_thread_safe_singleton(self):
self._test_singleton(ThreadSafeSingleton)
if __name__ == '__main__':
unittest.main()
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