def test_errback(self):
"""
The L{Deferred} returned by L{task.deferLater} is errbacked if the
supplied function raises an exception.
"""
def callable():
raise TestException()
clock = task.Clock()
d = task.deferLater(clock, 1, callable)
clock.advance(1)
return self.assertFailure(d, TestException)
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