diff --git a/tests/storage/test__init__.py b/tests/storage/test__init__.py
new file mode 100644
index 0000000000..f19cb1265c
--- /dev/null
+++ b/tests/storage/test__init__.py
@@ -0,0 +1,65 @@
+# -*- coding: utf-8 -*-
+# Copyright 2018 New Vector 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 twisted.internet import defer
+
+import tests.utils
+
+
+class InitTestCase(tests.unittest.TestCase):
+ def __init__(self, *args, **kwargs):
+ super(InitTestCase, self).__init__(*args, **kwargs)
+ self.store = None # type: synapse.storage.DataStore
+
+ @defer.inlineCallbacks
+ def setUp(self):
+ hs = yield tests.utils.setup_test_homeserver()
+
+ hs.config.max_mau_value = 50
+ hs.config.limit_usage_by_mau = True
+ self.store = hs.get_datastore()
+ self.clock = hs.get_clock()
+
+ @defer.inlineCallbacks
+ def test_count_monthly_users(self):
+ count = yield self.store.count_monthly_users()
+ self.assertEqual(0, count)
+
+ yield self._insert_user_ips("@user:server1")
+ yield self._insert_user_ips("@user:server2")
+
+ count = yield self.store.count_monthly_users()
+ self.assertEqual(2, count)
+
+ @defer.inlineCallbacks
+ def _insert_user_ips(self, user):
+ """
+ Helper function to populate user_ips without using batch insertion infra
+ args:
+ user (str): specify username i.e. @user:server.com
+ """
+ yield self.store._simple_upsert(
+ table="user_ips",
+ keyvalues={
+ "user_id": user,
+ "access_token": "access_token",
+ "ip": "ip",
+ "user_agent": "user_agent",
+ "device_id": "device_id",
+ },
+ values={
+ "last_seen": self.clock.time_msec(),
+ }
+ )
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