Fixed regression from ffc37e23.

}

def caches_setting_for_tests(**params):

    setting = dict((k, v.copy()) for k, v in _caches_setting_base.items())

    for cache_params in setting.values():

def caches_setting_for_tests(base=None, **params):

    # `base` is used to pull in the memcached config from the original settings,

    # `params` are test specific overrides and `_caches_settings_base` is the

    # base config for the tests.

    # This results in the following search order:

    # params -> _caches_setting_base -> base

    base = base or {}

    setting = dict((k, base.copy()) for k in _caches_setting_base.keys())

    for key, cache_params in setting.items():

        cache_params.update(_caches_setting_base[key])

        cache_params.update(params)

    return setting

@unittest.skipUnless(memcached_params, "memcached not available")

@override_settings(CACHES=caches_setting_for_tests(**memcached_params))

@override_settings(CACHES=caches_setting_for_tests(base=memcached_params))

class MemcachedCacheTests(BaseCacheTests, TestCase):

    def test_invalid_keys(self):

    # Explicitly display a skipped test if no configured cache uses MemcachedCache

    @unittest.skipUnless(

        any(c['BACKEND'] == 'django.core.cache.backends.memcached.MemcachedCache'

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

        memcached_params['BACKEND'] == 'django.core.cache.backends.memcached.MemcachedCache',

        "cache with python-memcached library not available")

    def test_memcached_uses_highest_pickle_version(self):

        # Regression test for #19810