diff --git a/tests/storage/test_purge.py b/tests/storage/test_purge.py
new file mode 100644
index 0000000000..f671599cb8
--- /dev/null
+++ b/tests/storage/test_purge.py
@@ -0,0 +1,106 @@
+# -*- 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 synapse.rest.client.v1 import room
+
+from tests.unittest import HomeserverTestCase
+
+
+class PurgeTests(HomeserverTestCase):
+
+ user_id = "@red:server"
+ servlets = [room.register_servlets]
+
+ def make_homeserver(self, reactor, clock):
+ hs = self.setup_test_homeserver("server", http_client=None)
+ return hs
+
+ def prepare(self, reactor, clock, hs):
+ self.room_id = self.helper.create_room_as(self.user_id)
+
+ def test_purge(self):
+ """
+ Purging a room will delete everything before the topological point.
+ """
+ # Send four messages to the room
+ first = self.helper.send(self.room_id, body="test1")
+ second = self.helper.send(self.room_id, body="test2")
+ third = self.helper.send(self.room_id, body="test3")
+ last = self.helper.send(self.room_id, body="test4")
+
+ storage = self.hs.get_datastore()
+
+ # Get the topological token
+ event = storage.get_topological_token_for_event(last["event_id"])
+ self.pump()
+ event = self.successResultOf(event)
+
+ # Purge everything before this topological token
+ purge = storage.purge_history(self.room_id, event, True)
+ self.pump()
+ self.assertEqual(self.successResultOf(purge), None)
+
+ # Try and get the events
+ get_first = storage.get_event(first["event_id"])
+ get_second = storage.get_event(second["event_id"])
+ get_third = storage.get_event(third["event_id"])
+ get_last = storage.get_event(last["event_id"])
+ self.pump()
+
+ # 1-3 should fail and last will succeed, meaning that 1-3 are deleted
+ # and last is not.
+ self.failureResultOf(get_first)
+ self.failureResultOf(get_second)
+ self.failureResultOf(get_third)
+ self.successResultOf(get_last)
+
+ def test_purge_wont_delete_extrems(self):
+ """
+ Purging a room will delete everything before the topological point.
+ """
+ # Send four messages to the room
+ first = self.helper.send(self.room_id, body="test1")
+ second = self.helper.send(self.room_id, body="test2")
+ third = self.helper.send(self.room_id, body="test3")
+ last = self.helper.send(self.room_id, body="test4")
+
+ storage = self.hs.get_datastore()
+
+ # Set the topological token higher than it should be
+ event = storage.get_topological_token_for_event(last["event_id"])
+ self.pump()
+ event = self.successResultOf(event)
+ event = "t{}-{}".format(
+ *list(map(lambda x: x + 1, map(int, event[1:].split("-"))))
+ )
+
+ # Purge everything before this topological token
+ purge = storage.purge_history(self.room_id, event, True)
+ self.pump()
+ f = self.failureResultOf(purge)
+ self.assertIn("greater than forward", f.value.args[0])
+
+ # Try and get the events
+ get_first = storage.get_event(first["event_id"])
+ get_second = storage.get_event(second["event_id"])
+ get_third = storage.get_event(third["event_id"])
+ get_last = storage.get_event(last["event_id"])
+ self.pump()
+
+ # Nothing is deleted.
+ self.successResultOf(get_first)
+ self.successResultOf(get_second)
+ self.successResultOf(get_third)
+ self.successResultOf(get_last)
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