diff --git a/tests/rest/client/v2_alpha/test_upgrade_room.py b/tests/rest/client/v2_alpha/test_upgrade_room.py
new file mode 100644
index 0000000000..7c22293d6d
--- /dev/null
+++ b/tests/rest/client/v2_alpha/test_upgrade_room.py
@@ -0,0 +1,153 @@
+# -*- coding: utf-8 -*-
+# Copyright 2021 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 typing import Optional
+
+from synapse.config.server import DEFAULT_ROOM_VERSION
+from synapse.rest import admin
+from synapse.rest.client.v1 import login, room
+from synapse.rest.client.v2_alpha import room_upgrade_rest_servlet
+
+from tests import unittest
+from tests.server import FakeChannel
+
+
+class UpgradeRoomTest(unittest.HomeserverTestCase):
+ servlets = [
+ admin.register_servlets,
+ login.register_servlets,
+ room.register_servlets,
+ room_upgrade_rest_servlet.register_servlets,
+ ]
+
+ def prepare(self, reactor, clock, hs):
+ self.store = hs.get_datastore()
+ self.handler = hs.get_user_directory_handler()
+
+ self.creator = self.register_user("creator", "pass")
+ self.creator_token = self.login(self.creator, "pass")
+
+ self.other = self.register_user("user", "pass")
+ self.other_token = self.login(self.other, "pass")
+
+ self.room_id = self.helper.create_room_as(self.creator, tok=self.creator_token)
+ self.helper.join(self.room_id, self.other, tok=self.other_token)
+
+ def _upgrade_room(self, token: Optional[str] = None) -> FakeChannel:
+ # We never want a cached response.
+ self.reactor.advance(5 * 60 + 1)
+
+ return self.make_request(
+ "POST",
+ "/_matrix/client/r0/rooms/%s/upgrade" % self.room_id,
+ # This will upgrade a room to the same version, but that's fine.
+ content={"new_version": DEFAULT_ROOM_VERSION},
+ access_token=token or self.creator_token,
+ )
+
+ def test_upgrade(self):
+ """
+ Upgrading a room should work fine.
+ """
+ channel = self._upgrade_room()
+ self.assertEquals(200, channel.code, channel.result)
+ self.assertIn("replacement_room", channel.json_body)
+
+ def test_not_in_room(self):
+ """
+ Upgrading a room should work fine.
+ """
+ # THe user isn't in the room.
+ roomless = self.register_user("roomless", "pass")
+ roomless_token = self.login(roomless, "pass")
+
+ channel = self._upgrade_room(roomless_token)
+ self.assertEquals(403, channel.code, channel.result)
+
+ def test_power_levels(self):
+ """
+ Another user can upgrade the room if their power level is increased.
+ """
+ # The other user doesn't have the proper power level.
+ channel = self._upgrade_room(self.other_token)
+ self.assertEquals(403, channel.code, channel.result)
+
+ # Increase the power levels so that this user can upgrade.
+ power_levels = self.helper.get_state(
+ self.room_id, "m.room.power_levels", tok=self.creator_token,
+ )
+ power_levels["users"][self.other] = 100
+ self.helper.send_state(
+ self.room_id,
+ "m.room.power_levels",
+ body=power_levels,
+ tok=self.creator_token,
+ )
+
+ # The upgrade should succeed!
+ channel = self._upgrade_room(self.other_token)
+ self.assertEquals(200, channel.code, channel.result)
+
+ def test_power_levels_user_default(self):
+ """
+ Another user can upgrade the room if the default power level for users is increased.
+ """
+ # The other user doesn't have the proper power level.
+ channel = self._upgrade_room(self.other_token)
+ self.assertEquals(403, channel.code, channel.result)
+
+ # Increase the power levels so that this user can upgrade.
+ power_levels = self.helper.get_state(
+ self.room_id, "m.room.power_levels", tok=self.creator_token,
+ )
+ power_levels["users_default"] = 100
+ self.helper.send_state(
+ self.room_id,
+ "m.room.power_levels",
+ body=power_levels,
+ tok=self.creator_token,
+ )
+
+ # The upgrade should succeed!
+ channel = self._upgrade_room(self.other_token)
+ self.assertEquals(200, channel.code, channel.result)
+
+ def test_power_levels_tombstone(self):
+ """
+ Another user can upgrade the room if they can send the tombstone event.
+ """
+ # The other user doesn't have the proper power level.
+ channel = self._upgrade_room(self.other_token)
+ self.assertEquals(403, channel.code, channel.result)
+
+ # Increase the power levels so that this user can upgrade.
+ power_levels = self.helper.get_state(
+ self.room_id, "m.room.power_levels", tok=self.creator_token,
+ )
+ power_levels["events"]["m.room.tombstone"] = 0
+ self.helper.send_state(
+ self.room_id,
+ "m.room.power_levels",
+ body=power_levels,
+ tok=self.creator_token,
+ )
+
+ # The upgrade should succeed!
+ channel = self._upgrade_room(self.other_token)
+ self.assertEquals(200, channel.code, channel.result)
+
+ power_levels = self.helper.get_state(
+ self.room_id, "m.room.power_levels", tok=self.creator_token,
+ )
+ self.assertNotIn(self.other, power_levels["users"])
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