diff --git a/tests/storage/test__base.py b/tests/storage/test__base.py
new file mode 100644
index 0000000000..057f798640
--- /dev/null
+++ b/tests/storage/test__base.py
@@ -0,0 +1,89 @@
+# -*- coding: utf-8 -*-
+# Copyright 2015 OpenMarket Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+from tests import unittest
+from twisted.internet import defer
+
+from synapse.storage._base import cached
+
+
+class CacheDecoratorTestCase(unittest.TestCase):
+
+ @defer.inlineCallbacks
+ def test_passthrough(self):
+ @cached()
+ def func(self, key):
+ return key
+
+ self.assertEquals((yield func(self, "foo")), "foo")
+ self.assertEquals((yield func(self, "bar")), "bar")
+
+ @defer.inlineCallbacks
+ def test_hit(self):
+ callcount = [0]
+
+ @cached()
+ def func(self, key):
+ callcount[0] += 1
+ return key
+
+ yield func(self, "foo")
+
+ self.assertEquals(callcount[0], 1)
+
+ self.assertEquals((yield func(self, "foo")), "foo")
+ self.assertEquals(callcount[0], 1)
+
+ @defer.inlineCallbacks
+ def test_invalidate(self):
+ callcount = [0]
+
+ @cached()
+ def func(self, key):
+ callcount[0] += 1
+ return key
+
+ yield func(self, "foo")
+
+ self.assertEquals(callcount[0], 1)
+
+ func.invalidate("foo")
+
+ yield func(self, "foo")
+
+ self.assertEquals(callcount[0], 2)
+
+ @defer.inlineCallbacks
+ def test_max_entries(self):
+ callcount = [0]
+
+ @cached(max_entries=10)
+ def func(self, key):
+ callcount[0] += 1
+ return key
+
+ for k in range(0,12):
+ yield func(self, k)
+
+ self.assertEquals(callcount[0], 12)
+
+ # There must have been at least 2 evictions, meaning if we calculate
+ # all 12 values again, we must get called at least 2 more times
+ for k in range(0,12):
+ yield func(self, k)
+
+ self.assertTrue(callcount[0] >= 14,
+ msg="Expected callcount >= 14, got %d" % (callcount[0]))
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