def test_basic(self):
f = lambda msg=None: fail(Failure(Exception(msg)))
d = combine([])
assert d.called, "An empty combine should return an already fired deferred when no deferreds were passed to it"
d = combine([succeed(None)])
assert callback_called(d), "ombine should return an already fired deferred when a success deferred was passed to it"
d = combine([f()])
assert errback_called(d)
d = combine([succeed(None), f()])
assert errback_called(d)
d = combine([f(), succeed(None)])
assert errback_called(d)
d = combine([succeed(None), succeed(None), succeed(None), succeed(None)])
assert not errback_called(d)
assert callback_called(d)
def test_with_no_timeout():
clock = Clock()
d = with_timeout(None, Deferred(), clock)
clock.advance(9999999999999999)
assert not errback_called(d)
