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#!/usr/bin/python
# -*- coding: utf-8 -*-
from migrate.tests import fixture
from migrate.versioning.util.keyedinstance import *
class TestKeydInstance(fixture.Base):
def test_unique(self):
"""UniqueInstance should produce unique object instances"""
class Uniq1(KeyedInstance):
@classmethod
def _key(cls,key):
return str(key)
def __init__(self,value):
self.value=value
class Uniq2(KeyedInstance):
@classmethod
def _key(cls,key):
return str(key)
def __init__(self,value):
self.value=value
a10 = Uniq1('a')
# Different key: different instance
b10 = Uniq1('b')
self.assert_(a10 is not b10)
# Different class: different instance
a20 = Uniq2('a')
self.assert_(a10 is not a20)
# Same key/class: same instance
a11 = Uniq1('a')
self.assert_(a10 is a11)
# __init__ is called
self.assertEquals(a10.value,'a')
# clear() causes us to forget all existing instances
Uniq1.clear()
a12 = Uniq1('a')
self.assert_(a10 is not a12)
self.assertRaises(NotImplementedError, KeyedInstance._key)
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