actually at the new test

tests/unit/test_cluster_task_scheduler.py

@@ -0,0 +1,38 @@
+# Copyright 2013-2016 DataStax, Inc.
+#
+# 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.
+
+try:
+    import unittest2 as unittest
+except ImportError:
+    import unittest  # noqa
+
+from mock import patch
+
+from cassandra.cluster import _Scheduler
+
+
+class SchedulerTest(unittest.TestCase):
+    # TODO: this suite could be expanded; for now just adding a test covering a ticket
+
+    @patch('time.time', return_value=3)  # always queue at same time
+    @patch('cassandra.cluster._Scheduler.run')  # don't actually run the thread
+    def test_event_delay_timing(self, *args):
+        """
+        Schedule something with a time collision to make sure the heap comparison works
+
+        PYTHON-473
+        """
+        sched = _Scheduler(None)
+        sched.schedule(0, lambda: None)
+        sched.schedule(0, lambda: None)  # pre-473: "TypeError: unorderable types: function() < function()"t