diff --git a/tests/config/test_ratelimiting.py b/tests/config/test_ratelimiting.py
new file mode 100644
index 0000000000..13ab282384
--- /dev/null
+++ b/tests/config/test_ratelimiting.py
@@ -0,0 +1,40 @@
+# -*- 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.config.homeserver import HomeServerConfig
+
+from tests.unittest import TestCase
+from tests.utils import default_config
+
+
+class RatelimitConfigTestCase(TestCase):
+ def test_parse_rc_federation(self):
+ config_dict = default_config("test")
+ config_dict["rc_federation"] = {
+ "window_size": 20000,
+ "sleep_limit": 693,
+ "sleep_delay": 252,
+ "reject_limit": 198,
+ "concurrent": 7,
+ }
+
+ config = HomeServerConfig()
+ config.parse_config_dict(config_dict, "", "")
+ config_obj = config.rc_federation
+
+ self.assertEqual(config_obj.window_size, 20000)
+ self.assertEqual(config_obj.sleep_limit, 693)
+ self.assertEqual(config_obj.sleep_delay, 252)
+ self.assertEqual(config_obj.reject_limit, 198)
+ self.assertEqual(config_obj.concurrent, 7)
diff --git a/tests/util/test_ratelimitutils.py b/tests/util/test_ratelimitutils.py
new file mode 100644
index 0000000000..4d1aee91d5
--- /dev/null
+++ b/tests/util/test_ratelimitutils.py
@@ -0,0 +1,97 @@
+# -*- 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.config.homeserver import HomeServerConfig
+from synapse.util.ratelimitutils import FederationRateLimiter
+
+from tests.server import get_clock
+from tests.unittest import TestCase
+from tests.utils import default_config
+
+
+class FederationRateLimiterTestCase(TestCase):
+ def test_ratelimit(self):
+ """A simple test with the default values"""
+ reactor, clock = get_clock()
+ rc_config = build_rc_config()
+ ratelimiter = FederationRateLimiter(clock, rc_config)
+
+ with ratelimiter.ratelimit("testhost") as d1:
+ # shouldn't block
+ self.successResultOf(d1)
+
+ def test_concurrent_limit(self):
+ """Test what happens when we hit the concurrent limit"""
+ reactor, clock = get_clock()
+ rc_config = build_rc_config({"rc_federation": {"concurrent": 2}})
+ ratelimiter = FederationRateLimiter(clock, rc_config)
+
+ with ratelimiter.ratelimit("testhost") as d1:
+ # shouldn't block
+ self.successResultOf(d1)
+
+ cm2 = ratelimiter.ratelimit("testhost")
+ d2 = cm2.__enter__()
+ # also shouldn't block
+ self.successResultOf(d2)
+
+ cm3 = ratelimiter.ratelimit("testhost")
+ d3 = cm3.__enter__()
+ # this one should block, though ...
+ self.assertNoResult(d3)
+
+ # ... until we complete an earlier request
+ cm2.__exit__(None, None, None)
+ self.successResultOf(d3)
+
+ def test_sleep_limit(self):
+ """Test what happens when we hit the sleep limit"""
+ reactor, clock = get_clock()
+ rc_config = build_rc_config(
+ {"rc_federation": {"sleep_limit": 2, "sleep_delay": 500}}
+ )
+ ratelimiter = FederationRateLimiter(clock, rc_config)
+
+ with ratelimiter.ratelimit("testhost") as d1:
+ # shouldn't block
+ self.successResultOf(d1)
+
+ with ratelimiter.ratelimit("testhost") as d2:
+ # nor this
+ self.successResultOf(d2)
+
+ with ratelimiter.ratelimit("testhost") as d3:
+ # this one should block, though ...
+ self.assertNoResult(d3)
+ sleep_time = _await_resolution(reactor, d3)
+ self.assertAlmostEqual(sleep_time, 500, places=3)
+
+
+def _await_resolution(reactor, d):
+ """advance the clock until the deferred completes.
+
+ Returns the number of milliseconds it took to complete.
+ """
+ start_time = reactor.seconds()
+ while not d.called:
+ reactor.advance(0.01)
+ return (reactor.seconds() - start_time) * 1000
+
+
+def build_rc_config(settings={}):
+ config_dict = default_config("test")
+ config_dict.update(settings)
+ config = HomeServerConfig()
+ config.parse_config_dict(config_dict, "", "")
+ return config.rc_federation
diff --git a/tests/utils.py b/tests/utils.py
index d8e55b0801..8a94ce0b47 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -152,12 +152,6 @@ def default_config(name, parse=False):
"mau_stats_only": False,
"mau_limits_reserved_threepids": [],
"admin_contact": None,
- "rc_federation": {
- "reject_limit": 10,
- "sleep_limit": 10,
- "sleep_delay": 10,
- "concurrent": 10,
- },
"rc_message": {"per_second": 10000, "burst_count": 10000},
"rc_registration": {"per_second": 10000, "burst_count": 10000},
"rc_login": {
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