When calling the Connection Classes .check_closed method an exception is raised:
Traceback (most recent call last):
File "<test>/Harness_Test.py", line 24, in test_create_connection
File "/usr/local/lib/python2.7/site-packages/qpid/messaging/endpoints.py", line 200, in check_closed
AttributeError: Connection instance has no attribute 'closed'
The fix is pretty simple, get rid of the method, or add a self.closed flag to indicate failure...