diff --git a/tests/storage/test_event_metrics.py b/tests/storage/test_event_metrics.py
new file mode 100644
index 0000000000..19f9ccf5e0
--- /dev/null
+++ b/tests/storage/test_event_metrics.py
@@ -0,0 +1,82 @@
+# -*- 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 prometheus_client.exposition import generate_latest
+
+from synapse.metrics import REGISTRY
+from synapse.types import Requester, UserID
+
+from tests.unittest import HomeserverTestCase
+
+
+class ExtremStatisticsTestCase(HomeserverTestCase):
+ def test_exposed_to_prometheus(self):
+ """
+ Forward extremity counts are exposed via Prometheus.
+ """
+ room_creator = self.hs.get_room_creation_handler()
+
+ user = UserID("alice", "test")
+ requester = Requester(user, None, False, None, None)
+
+ # Real events, forward extremities
+ events = [(3, 2), (6, 2), (4, 6)]
+
+ for event_count, extrems in events:
+ info = self.get_success(room_creator.create_room(requester, {}))
+ room_id = info["room_id"]
+
+ last_event = None
+
+ # Make a real event chain
+ for i in range(event_count):
+ ev = self.create_and_send_event(room_id, user, False, last_event)
+ last_event = [ev]
+
+ # Sprinkle in some extremities
+ for i in range(extrems):
+ ev = self.create_and_send_event(room_id, user, False, last_event)
+
+ # Let it run for a while, then pull out the statistics from the
+ # Prometheus client registry
+ self.reactor.advance(60 * 60 * 1000)
+ self.pump(1)
+
+ items = set(
+ filter(
+ lambda x: b"synapse_forward_extremities_" in x,
+ generate_latest(REGISTRY).split(b"\n"),
+ )
+ )
+
+ expected = set([
+ b'synapse_forward_extremities_bucket{le="1.0"} 0.0',
+ b'synapse_forward_extremities_bucket{le="2.0"} 2.0',
+ b'synapse_forward_extremities_bucket{le="3.0"} 2.0',
+ b'synapse_forward_extremities_bucket{le="5.0"} 2.0',
+ b'synapse_forward_extremities_bucket{le="7.0"} 3.0',
+ b'synapse_forward_extremities_bucket{le="10.0"} 3.0',
+ b'synapse_forward_extremities_bucket{le="15.0"} 3.0',
+ b'synapse_forward_extremities_bucket{le="20.0"} 3.0',
+ b'synapse_forward_extremities_bucket{le="50.0"} 3.0',
+ b'synapse_forward_extremities_bucket{le="100.0"} 3.0',
+ b'synapse_forward_extremities_bucket{le="200.0"} 3.0',
+ b'synapse_forward_extremities_bucket{le="500.0"} 3.0',
+ b'synapse_forward_extremities_bucket{le="+Inf"} 3.0',
+ b'synapse_forward_extremities_count 3.0',
+ b'synapse_forward_extremities_sum 10.0',
+ ])
+
+ self.assertEqual(items, expected)
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