diff --git a/tests/http/test_fedclient.py b/tests/http/test_fedclient.py
new file mode 100644
index 0000000000..1c46c9cfeb
--- /dev/null
+++ b/tests/http/test_fedclient.py
@@ -0,0 +1,157 @@
+# -*- 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 mock import Mock
+
+from twisted.internet.defer import TimeoutError
+from twisted.internet.error import ConnectingCancelledError, DNSLookupError
+from twisted.web.client import ResponseNeverReceived
+
+from synapse.http.matrixfederationclient import MatrixFederationHttpClient
+
+from tests.unittest import HomeserverTestCase
+
+
+class FederationClientTests(HomeserverTestCase):
+ def make_homeserver(self, reactor, clock):
+
+ hs = self.setup_test_homeserver(reactor=reactor, clock=clock)
+ hs.tls_client_options_factory = None
+ return hs
+
+ def prepare(self, reactor, clock, homeserver):
+
+ self.cl = MatrixFederationHttpClient(self.hs)
+ self.reactor.lookups["testserv"] = "1.2.3.4"
+
+ def test_dns_error(self):
+ """
+ If the DNS raising returns an error, it will bubble up.
+ """
+ d = self.cl._request("testserv2:8008", "GET", "foo/bar", timeout=10000)
+ self.pump()
+
+ f = self.failureResultOf(d)
+ self.assertIsInstance(f.value, DNSLookupError)
+
+ def test_client_never_connect(self):
+ """
+ If the HTTP request is not connected and is timed out, it'll give a
+ ConnectingCancelledError.
+ """
+ d = self.cl._request("testserv:8008", "GET", "foo/bar", timeout=10000)
+
+ self.pump()
+
+ # Nothing happened yet
+ self.assertFalse(d.called)
+
+ # Make sure treq is trying to connect
+ clients = self.reactor.tcpClients
+ self.assertEqual(len(clients), 1)
+ self.assertEqual(clients[0][0], '1.2.3.4')
+ self.assertEqual(clients[0][1], 8008)
+
+ # Deferred is still without a result
+ self.assertFalse(d.called)
+
+ # Push by enough to time it out
+ self.reactor.advance(10.5)
+ f = self.failureResultOf(d)
+
+ self.assertIsInstance(f.value, ConnectingCancelledError)
+
+ def test_client_connect_no_response(self):
+ """
+ If the HTTP request is connected, but gets no response before being
+ timed out, it'll give a ResponseNeverReceived.
+ """
+ d = self.cl._request("testserv:8008", "GET", "foo/bar", timeout=10000)
+
+ self.pump()
+
+ # Nothing happened yet
+ self.assertFalse(d.called)
+
+ # Make sure treq is trying to connect
+ clients = self.reactor.tcpClients
+ self.assertEqual(len(clients), 1)
+ self.assertEqual(clients[0][0], '1.2.3.4')
+ self.assertEqual(clients[0][1], 8008)
+
+ conn = Mock()
+ client = clients[0][2].buildProtocol(None)
+ client.makeConnection(conn)
+
+ # Deferred is still without a result
+ self.assertFalse(d.called)
+
+ # Push by enough to time it out
+ self.reactor.advance(10.5)
+ f = self.failureResultOf(d)
+
+ self.assertIsInstance(f.value, ResponseNeverReceived)
+
+ def test_client_gets_headers(self):
+ """
+ Once the client gets the headers, _request returns successfully.
+ """
+ d = self.cl._request("testserv:8008", "GET", "foo/bar", timeout=10000)
+
+ self.pump()
+
+ conn = Mock()
+ clients = self.reactor.tcpClients
+ client = clients[0][2].buildProtocol(None)
+ client.makeConnection(conn)
+
+ # Deferred does not have a result
+ self.assertFalse(d.called)
+
+ # Send it the HTTP response
+ client.dataReceived(b"HTTP/1.1 200 OK\r\nServer: Fake\r\n\r\n")
+
+ # We should get a successful response
+ r = self.successResultOf(d)
+ self.assertEqual(r.code, 200)
+
+ def test_client_headers_no_body(self):
+ """
+ If the HTTP request is connected, but gets no response before being
+ timed out, it'll give a ResponseNeverReceived.
+ """
+ d = self.cl.post_json("testserv:8008", "foo/bar", timeout=10000)
+
+ self.pump()
+
+ conn = Mock()
+ clients = self.reactor.tcpClients
+ client = clients[0][2].buildProtocol(None)
+ client.makeConnection(conn)
+
+ # Deferred does not have a result
+ self.assertFalse(d.called)
+
+ # Send it the HTTP response
+ client.dataReceived(
+ (b"HTTP/1.1 200 OK\r\nContent-Type: application/json\r\n"
+ b"Server: Fake\r\n\r\n")
+ )
+
+ # Push by enough to time it out
+ self.reactor.advance(10.5)
+ f = self.failureResultOf(d)
+
+ self.assertIsInstance(f.value, TimeoutError)
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