issue #406: add test.

tests/broker_test.py

@@ -1,6 +1,7 @@
 
 import threading
 
+import mock
 import unittest2
 
 import testlib
@@ -8,6 +9,19 @@ import testlib
 import mitogen.core
 
 
+class ShutdownTest(testlib.TestCase):
+    klass = mitogen.core.Broker
+
+    def test_poller_closed(self):
+        broker = self.klass()
+        actual_close = broker.poller.close
+        broker.poller.close = mock.Mock()
+        broker.shutdown()
+        broker.join()
+        self.assertEquals(1, len(broker.poller.close.mock_calls))
+        actual_close()
+
+
 class DeferSyncTest(testlib.TestCase):
     klass = mitogen.core.Broker