Fix roomlist since tokens on Python 3 (#4046)

Thanks @Half-Shot !!!

tests/handlers/test_roomlist.py

@@ -0,0 +1,39 @@
+# -*- 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.handlers.room_list import RoomListNextBatch
+
+import tests.unittest
+import tests.utils
+
+
+class RoomListTestCase(tests.unittest.TestCase):
+    """ Tests RoomList's RoomListNextBatch. """
+
+    def setUp(self):
+        pass
+
+    def test_check_read_batch_tokens(self):
+        batch_token = RoomListNextBatch(
+            stream_ordering="abcdef",
+            public_room_stream_id="123",
+            current_limit=20,
+            direction_is_forward=True,
+        ).to_token()
+        next_batch = RoomListNextBatch.from_token(batch_token)
+        self.assertEquals(next_batch.stream_ordering, "abcdef")
+        self.assertEquals(next_batch.public_room_stream_id, "123")
+        self.assertEquals(next_batch.current_limit, 20)
+        self.assertEquals(next_batch.direction_is_forward, True)