# Copyright 2007 Google Inc.
#
# This program 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 2
# of the License, or (at your option) any later version.
#
# This program 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, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
"""Unit tests for out cache factory."""

__author__ = 'springer@google.com (Matthew Springer)'

import unittest

from nss_cache.caches import caches
from nss_cache.caches import cache_factory


class TestCacheFactory(unittest.TestCase):

    def testRegister(self):

        class DummyCache(caches.Cache):
            pass

        old_cache_implementations = cache_factory._cache_implementations
        cache_factory._cache_implementations = {}
        cache_factory.RegisterImplementation('dummy', 'dummy', DummyCache)
        self.assertEqual(1, len(cache_factory._cache_implementations))
        self.assertEqual(1, len(cache_factory._cache_implementations['dummy']))
        self.assertEqual(DummyCache,
                         cache_factory._cache_implementations['dummy']['dummy'])
        cache_factory._cache_implementations = old_cache_implementations

    def testCreateWithNoImplementations(self):
        old_cache_implementations = cache_factory._cache_implementations
        cache_factory._cache_implementations = {}
        self.assertRaises(RuntimeError, cache_factory.Create, {}, 'map_name')
        cache_factory._cache_implementations = old_cache_implementations

    def testThatRegularImplementationsArePresent(self):
        self.assertEqual(len(cache_factory._cache_implementations), 2)


if __name__ == '__main__':
    unittest.main()
