diff --git a/tests/util/test_rwlock.py b/tests/util/test_rwlock.py
new file mode 100644
index 0000000000..1d745ae1a7
--- /dev/null
+++ b/tests/util/test_rwlock.py
@@ -0,0 +1,85 @@
+# -*- coding: utf-8 -*-
+# Copyright 2016 OpenMarket 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 tests import unittest
+
+from synapse.util.async import ReadWriteLock
+
+
+class ReadWriteLockTestCase(unittest.TestCase):
+
+ def _assert_called_before_not_after(self, lst, first_false):
+ for i, d in enumerate(lst[:first_false]):
+ self.assertTrue(d.called, msg="%d was unexpectedly false" % i)
+
+ for i, d in enumerate(lst[first_false:]):
+ self.assertFalse(
+ d.called, msg="%d was unexpectedly true" % (i + first_false)
+ )
+
+ def test_rwlock(self):
+ rwlock = ReadWriteLock()
+
+ key = object()
+
+ ds = [
+ rwlock.read(key), # 0
+ rwlock.read(key), # 1
+ rwlock.write(key), # 2
+ rwlock.write(key), # 3
+ rwlock.read(key), # 4
+ rwlock.read(key), # 5
+ rwlock.write(key), # 6
+ ]
+
+ self._assert_called_before_not_after(ds, 2)
+
+ with ds[0].result:
+ self._assert_called_before_not_after(ds, 2)
+ self._assert_called_before_not_after(ds, 2)
+
+ with ds[1].result:
+ self._assert_called_before_not_after(ds, 2)
+ self._assert_called_before_not_after(ds, 3)
+
+ with ds[2].result:
+ self._assert_called_before_not_after(ds, 3)
+ self._assert_called_before_not_after(ds, 4)
+
+ with ds[3].result:
+ self._assert_called_before_not_after(ds, 4)
+ self._assert_called_before_not_after(ds, 6)
+
+ with ds[5].result:
+ self._assert_called_before_not_after(ds, 6)
+ self._assert_called_before_not_after(ds, 6)
+
+ with ds[4].result:
+ self._assert_called_before_not_after(ds, 6)
+ self._assert_called_before_not_after(ds, 7)
+
+ with ds[6].result:
+ pass
+
+ d = rwlock.write(key)
+ self.assertTrue(d.called)
+ with d.result:
+ pass
+
+ d = rwlock.read(key)
+ self.assertTrue(d.called)
+ with d.result:
+ pass
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