diff --git a/tests/rest/client/test_redactions.py b/tests/rest/client/test_redactions.py
new file mode 100644
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--- /dev/null
+++ b/tests/rest/client/test_redactions.py
@@ -0,0 +1,159 @@
+# -*- coding: utf-8 -*-
+# Copyright 2019 The Matrix.org Foundation C.I.C.
+#
+# 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 import admin
+from synapse.rest.client.v1 import login, room
+from synapse.rest.client.v2_alpha import sync
+
+from tests.unittest import HomeserverTestCase
+
+
+class RedactionsTestCase(HomeserverTestCase):
+ """Tests that various redaction events are handled correctly"""
+
+ servlets = [
+ admin.register_servlets,
+ room.register_servlets,
+ login.register_servlets,
+ sync.register_servlets,
+ ]
+
+ def prepare(self, reactor, clock, hs):
+ # register a couple of users
+ self.mod_user_id = self.register_user("user1", "pass")
+ self.mod_access_token = self.login("user1", "pass")
+ self.other_user_id = self.register_user("otheruser", "pass")
+ self.other_access_token = self.login("otheruser", "pass")
+
+ # Create a room
+ self.room_id = self.helper.create_room_as(
+ self.mod_user_id, tok=self.mod_access_token
+ )
+
+ # Invite the other user
+ self.helper.invite(
+ room=self.room_id,
+ src=self.mod_user_id,
+ tok=self.mod_access_token,
+ targ=self.other_user_id,
+ )
+ # The other user joins
+ self.helper.join(
+ room=self.room_id, user=self.other_user_id, tok=self.other_access_token
+ )
+
+ def _redact_event(self, access_token, room_id, event_id, expect_code=200):
+ """Helper function to send a redaction event.
+
+ Returns the json body.
+ """
+ path = "/_matrix/client/r0/rooms/%s/redact/%s" % (room_id, event_id)
+
+ request, channel = self.make_request(
+ "POST", path, content={}, access_token=access_token
+ )
+ self.render(request)
+ self.assertEqual(int(channel.result["code"]), expect_code)
+ return channel.json_body
+
+ def _sync_room_timeline(self, access_token, room_id):
+ request, channel = self.make_request(
+ "GET", "sync", access_token=self.mod_access_token
+ )
+ self.render(request)
+ self.assertEqual(channel.result["code"], b"200")
+ room_sync = channel.json_body["rooms"]["join"][room_id]
+ return room_sync["timeline"]["events"]
+
+ def test_redact_event_as_moderator(self):
+ # as a regular user, send a message to redact
+ b = self.helper.send(room_id=self.room_id, tok=self.other_access_token)
+ msg_id = b["event_id"]
+
+ # as the moderator, send a redaction
+ b = self._redact_event(self.mod_access_token, self.room_id, msg_id)
+ redaction_id = b["event_id"]
+
+ # now sync
+ timeline = self._sync_room_timeline(self.mod_access_token, self.room_id)
+
+ # the last event should be the redaction
+ self.assertEqual(timeline[-1]["event_id"], redaction_id)
+ self.assertEqual(timeline[-1]["redacts"], msg_id)
+
+ # and the penultimate should be the redacted original
+ self.assertEqual(timeline[-2]["event_id"], msg_id)
+ self.assertEqual(timeline[-2]["unsigned"]["redacted_by"], redaction_id)
+ self.assertEqual(timeline[-2]["content"], {})
+
+ def test_redact_event_as_normal(self):
+ # as a regular user, send a message to redact
+ b = self.helper.send(room_id=self.room_id, tok=self.other_access_token)
+ normal_msg_id = b["event_id"]
+
+ # also send one as the admin
+ b = self.helper.send(room_id=self.room_id, tok=self.mod_access_token)
+ admin_msg_id = b["event_id"]
+
+ # as a normal, try to redact the admin's event
+ self._redact_event(
+ self.other_access_token, self.room_id, admin_msg_id, expect_code=403
+ )
+
+ # now try to redact our own event
+ b = self._redact_event(self.other_access_token, self.room_id, normal_msg_id)
+ redaction_id = b["event_id"]
+
+ # now sync
+ timeline = self._sync_room_timeline(self.other_access_token, self.room_id)
+
+ # the last event should be the redaction of the normal event
+ self.assertEqual(timeline[-1]["event_id"], redaction_id)
+ self.assertEqual(timeline[-1]["redacts"], normal_msg_id)
+
+ # the penultimate should be the unredacted one from the admin
+ self.assertEqual(timeline[-2]["event_id"], admin_msg_id)
+ self.assertNotIn("redacted_by", timeline[-2]["unsigned"])
+ self.assertTrue(timeline[-2]["content"]["body"], {})
+
+ # and the antepenultimate should be the redacted normal
+ self.assertEqual(timeline[-3]["event_id"], normal_msg_id)
+ self.assertEqual(timeline[-3]["unsigned"]["redacted_by"], redaction_id)
+ self.assertEqual(timeline[-3]["content"], {})
+
+ def test_redact_nonexistent_event(self):
+ # control case: an existing event
+ b = self.helper.send(room_id=self.room_id, tok=self.other_access_token)
+ msg_id = b["event_id"]
+ b = self._redact_event(self.other_access_token, self.room_id, msg_id)
+ redaction_id = b["event_id"]
+
+ # room moderators can send redactions for non-existent events
+ self._redact_event(self.mod_access_token, self.room_id, "$zzz")
+
+ # ... but normals cannot
+ self._redact_event(
+ self.other_access_token, self.room_id, "$zzz", expect_code=404
+ )
+
+ # when we sync, we should see only the valid redaction
+ timeline = self._sync_room_timeline(self.other_access_token, self.room_id)
+ self.assertEqual(timeline[-1]["event_id"], redaction_id)
+ self.assertEqual(timeline[-1]["redacts"], msg_id)
+
+ # and the penultimate should be the redacted original
+ self.assertEqual(timeline[-2]["event_id"], msg_id)
+ self.assertEqual(timeline[-2]["unsigned"]["redacted_by"], redaction_id)
+ self.assertEqual(timeline[-2]["content"], {})
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