'For two instances of L{DelayedCall} C{a} and C{b}, C{a < b} is true
if and only if C{a} is scheduled to run before C{b}.'

def test_lt(self):

    (zero, one) = (self.zero, self.one)
    self.assertTrue((zero < one))
    self.assertFalse((one < zero))
    self.assertFalse((zero < zero))
    self.assertFalse((one < one))
