diff --git a/tests/federation/test_federation_sender.py b/tests/federation/test_federation_sender.py
new file mode 100644
index 0000000000..28e7e27416
--- /dev/null
+++ b/tests/federation/test_federation_sender.py
@@ -0,0 +1,128 @@
+# -*- coding: utf-8 -*-
+# Copyright 2019 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 mock import Mock
+
+from twisted.internet import defer
+
+from synapse.types import ReadReceipt
+
+from tests.unittest import HomeserverTestCase
+
+
+class FederationSenderTestCases(HomeserverTestCase):
+ def make_homeserver(self, reactor, clock):
+ return super(FederationSenderTestCases, self).setup_test_homeserver(
+ state_handler=Mock(spec=["get_current_hosts_in_room"]),
+ federation_transport_client=Mock(spec=["send_transaction"]),
+ )
+
+ def test_send_receipts(self):
+ mock_state_handler = self.hs.get_state_handler()
+ mock_state_handler.get_current_hosts_in_room.return_value = ["test", "host2"]
+
+ mock_send_transaction = self.hs.get_federation_transport_client().send_transaction
+ mock_send_transaction.return_value = defer.succeed({})
+
+ sender = self.hs.get_federation_sender()
+ receipt = ReadReceipt("room_id", "m.read", "user_id", ["event_id"], {"ts": 1234})
+ self.successResultOf(sender.send_read_receipt(receipt))
+
+ self.pump()
+
+ # expect a call to send_transaction
+ mock_send_transaction.assert_called_once()
+ json_cb = mock_send_transaction.call_args[0][1]
+ data = json_cb()
+ self.assertEqual(data['edus'], [
+ {
+ 'edu_type': 'm.receipt',
+ 'content': {
+ 'room_id': {
+ 'm.read': {
+ 'user_id': {
+ 'event_ids': ['event_id'],
+ 'data': {'ts': 1234},
+ },
+ },
+ },
+ },
+ },
+ ])
+
+ def test_send_receipts_with_backoff(self):
+ """Send two receipts in quick succession; the second should be flushed, but
+ only after 20ms"""
+ mock_state_handler = self.hs.get_state_handler()
+ mock_state_handler.get_current_hosts_in_room.return_value = ["test", "host2"]
+
+ mock_send_transaction = self.hs.get_federation_transport_client().send_transaction
+ mock_send_transaction.return_value = defer.succeed({})
+
+ sender = self.hs.get_federation_sender()
+ receipt = ReadReceipt("room_id", "m.read", "user_id", ["event_id"], {"ts": 1234})
+ self.successResultOf(sender.send_read_receipt(receipt))
+
+ self.pump()
+
+ # expect a call to send_transaction
+ mock_send_transaction.assert_called_once()
+ json_cb = mock_send_transaction.call_args[0][1]
+ data = json_cb()
+ self.assertEqual(data['edus'], [
+ {
+ 'edu_type': 'm.receipt',
+ 'content': {
+ 'room_id': {
+ 'm.read': {
+ 'user_id': {
+ 'event_ids': ['event_id'],
+ 'data': {'ts': 1234},
+ },
+ },
+ },
+ },
+ },
+ ])
+ mock_send_transaction.reset_mock()
+
+ # send the second RR
+ receipt = ReadReceipt("room_id", "m.read", "user_id", ["other_id"], {"ts": 1234})
+ self.successResultOf(sender.send_read_receipt(receipt))
+ self.pump()
+ mock_send_transaction.assert_not_called()
+
+ self.reactor.advance(19)
+ mock_send_transaction.assert_not_called()
+
+ self.reactor.advance(10)
+ mock_send_transaction.assert_called_once()
+ json_cb = mock_send_transaction.call_args[0][1]
+ data = json_cb()
+ self.assertEqual(data['edus'], [
+ {
+ 'edu_type': 'm.receipt',
+ 'content': {
+ 'room_id': {
+ 'm.read': {
+ 'user_id': {
+ 'event_ids': ['other_id'],
+ 'data': {'ts': 1234},
+ },
+ },
+ },
+ },
+ },
+ ])
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