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[Robert Collins <584824@xxxxxxxxxxxxxxxxxx>]

The x/ _ was meant to indicate the return value from setUp/run/tearDown.

-- 
hook to have a callable called after test methods return
https://bugs.launchpad.net/bugs/584824
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Status in testtools: Triaged

Bug description:
E.g.

self.call_after_test_function(lambda _:storm.flush())

or

self.call_after_test_function(lambda x: reactor.run_until(x)) 

This would be useful for launchpad, and a step towards trial integration.