Run memcache tests if any cache is configured

# memcached backend isn't guaranteed to be available.

# To check the memcached backend, the test settings file will

# need to contain a cache backend setting that points at

# need to contain at least one cache backend setting that points at

# your memcache server.

@unittest.skipUnless(

    settings.CACHES[DEFAULT_CACHE_ALIAS]['BACKEND'].startswith('django.core.cache.backends.memcached.'),

    any(cache['BACKEND'].startswith('django.core.cache.backends.memcached.')

        for cache in settings.CACHES.values()),

    "memcached not available")

class MemcachedCacheTests(unittest.TestCase, BaseCacheTests):

    backend_name = 'django.core.cache.backends.memcached.MemcachedCache'

    def setUp(self):

        name = settings.CACHES[DEFAULT_CACHE_ALIAS]['LOCATION']

        for cache in settings.CACHES.values():

            if cache['BACKEND'].startswith('django.core.cache.backends.memcached.'):

                name = cache['LOCATION']

                break

        self.cache = get_cache(self.backend_name, LOCATION=name)

        self.prefix_cache = get_cache(self.backend_name, LOCATION=name, KEY_PREFIX='cacheprefix')

        self.v2_cache = get_cache(self.backend_name, LOCATION=name, VERSION=2)