diff --git a/tests/test_distributor.py b/tests/test_distributor.py
new file mode 100644
index 0000000000..36cbf6c52d
--- /dev/null
+++ b/tests/test_distributor.py
@@ -0,0 +1,74 @@
+import unittest
+
+from twisted.internet import defer
+
+from mock import Mock, patch
+
+from synapse.util.distributor import Distributor
+
+
+class DistributorTestCase(unittest.TestCase):
+
+ def setUp(self):
+ self.dist = Distributor()
+
+ def test_signal_dispatch(self):
+ self.dist.declare("alert")
+
+ observer = Mock()
+ self.dist.observe("alert", observer)
+
+ d = self.dist.fire("alert", 1, 2, 3)
+
+ self.assertTrue(d.called)
+ observer.assert_called_with(1, 2, 3)
+
+ def test_signal_dispatch_deferred(self):
+ self.dist.declare("whine")
+
+ d_inner = defer.Deferred()
+ def observer():
+ return d_inner
+ self.dist.observe("whine", observer)
+
+ d_outer = self.dist.fire("whine")
+
+ self.assertFalse(d_outer.called)
+
+ d_inner.callback(None)
+ self.assertTrue(d_outer.called)
+
+ def test_signal_catch(self):
+ self.dist.declare("alarm")
+
+ observers = [Mock() for i in 1, 2]
+ for o in observers:
+ self.dist.observe("alarm", o)
+
+ observers[0].side_effect = Exception("Awoogah!")
+
+ with patch("synapse.util.distributor.logger",
+ spec=["warning"]
+ ) as mock_logger:
+ d = self.dist.fire("alarm", "Go")
+ self.assertTrue(d.called)
+
+ observers[0].assert_called_once("Go")
+ observers[1].assert_called_once("Go")
+
+ self.assertEquals(mock_logger.warning.call_count, 1)
+ self.assertIsInstance(mock_logger.warning.call_args[0][0],
+ str)
+
+ def test_signal_prereg(self):
+ observer = Mock()
+ self.dist.observe("flare", observer)
+
+ self.dist.declare("flare")
+ self.dist.fire("flare", 4, 5)
+
+ observer.assert_called_with(4, 5)
+
+ def test_signal_undeclared(self):
+ with self.assertRaises(KeyError):
+ self.dist.fire("notification")
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