diff --git a/tests/storage/test_state.py b/tests/storage/test_state.py
new file mode 100644
index 0000000000..acf36e077f
--- /dev/null
+++ b/tests/storage/test_state.py
@@ -0,0 +1,151 @@
+# -*- 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
+
+from synapse.api.constants import EventTypes, Membership
+from synapse.types import RoomID, UserID
+
+import tests.unittest
+import tests.utils
+
+
+class StateStoreTestCase(tests.unittest.TestCase):
+ def __init__(self, *args, **kwargs):
+ super(StateStoreTestCase, self).__init__(*args, **kwargs)
+ self.store = None # type: synapse.storage.DataStore
+
+ @defer.inlineCallbacks
+ def setUp(self):
+ hs = yield tests.utils.setup_test_homeserver()
+
+ self.store = hs.get_datastore()
+ self.event_builder_factory = hs.get_event_builder_factory()
+ self.event_creation_handler = hs.get_event_creation_handler()
+
+ self.u_alice = UserID.from_string("@alice:test")
+ self.u_bob = UserID.from_string("@bob:test")
+
+ # User elsewhere on another host
+ self.u_charlie = UserID.from_string("@charlie:elsewhere")
+
+ self.room = RoomID.from_string("!abc123:test")
+
+ yield self.store.store_room(
+ self.room.to_string(),
+ room_creator_user_id="@creator:text",
+ is_public=True
+ )
+
+ @defer.inlineCallbacks
+ def inject_state_event(self, room, sender, typ, state_key, content):
+ builder = self.event_builder_factory.new({
+ "type": typ,
+ "sender": sender.to_string(),
+ "state_key": state_key,
+ "room_id": room.to_string(),
+ "content": content,
+ })
+
+ event, context = yield self.event_creation_handler.create_new_client_event(
+ builder
+ )
+
+ yield self.store.persist_event(event, context)
+
+ defer.returnValue(event)
+
+ @defer.inlineCallbacks
+ def test_get_state_for_events(self):
+
+ # this defaults to a linear DAG as each new injection defaults to whatever
+ # forward extremities are currently in the DB for this room.
+ (e1, c1) = yield self.inject_state_event(
+ self.room, self.u_alice, EventTypes.Create, '', {},
+ )
+ (e2, c2) = yield self.inject_state_event(
+ self.room, self.u_alice, EventTypes.Name, '', {
+ "name": "test room"
+ },
+ )
+ (e3, c3) = yield self.inject_state_event(
+ self.room, self.u_alice, EventTypes.Member, self.u_alice, {
+ "membership": Membership.JOIN
+ },
+ )
+ (e4, c4) = yield self.inject_state_event(
+ self.room, self.u_bob, EventTypes.Member, self.u_bob, {
+ "membership": Membership.JOIN
+ },
+ )
+ (e5, c5) = yield self.inject_state_event(
+ self.room, self.u_bob, EventTypes.Member, self.u_bob, {
+ "membership": Membership.LEAVE
+ },
+ )
+
+ # check we get the full state as of the final event
+ state = yield self.store.get_state_for_events(
+ e5.event_id, None, filtered_types=None
+ )
+
+ self.assertDictEqual({
+ (e1.type, e1.state_key): e1.event_id,
+ (e2.type, e2.state_key): e2.event_id,
+ (e3.type, e3.state_key): e3.event_id,
+ # e4 is overwritten by e5
+ (e5.type, e5.state_key): e5.event_id,
+ }, state)
+
+ # check we can filter to the m.room.name event (with a '' state key)
+ state = yield self.store.get_state_for_events(
+ e5.event_id, ((EventTypes.Name, '')), filtered_types=None
+ )
+
+ self.assertDictEqual({
+ (e2.type, e2.state_key): e2.event_id,
+ }, state)
+
+ # check we can filter to the m.room.name event (with a wildcard None state key)
+ state = yield self.store.get_state_for_events(
+ e5.event_id, ((EventTypes.Name, None)), filtered_types=None
+ )
+
+ self.assertDictEqual({
+ (e2.type, e2.state_key): e2.event_id,
+ }, state)
+
+ # check we can grab the m.room.member events (with a wildcard None state key)
+ state = yield self.store.get_state_for_events(
+ e5.event_id, ((EventTypes.Member, None)), filtered_types=None
+ )
+
+ self.assertDictEqual({
+ (e3.type, e3.state_key): e3.event_id,
+ (e5.type, e5.state_key): e5.event_id,
+ }, state)
+
+ # check we can use filter_types to grab a specific room member
+ # without filtering out the other event types
+ state = yield self.store.get_state_for_events(
+ e5.event_id, ((EventTypes.Member, self.u_alice)),
+ filtered_types=[EventTypes.Member],
+ )
+
+ self.assertDictEqual({
+ (e1.type, e1.state_key): e3.event_id,
+ (e2.type, e2.state_key): e3.event_id,
+ (e3.type, e3.state_key): e5.event_id,
+ }, state)
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