test_defer.py 文件源码

def testMaybeDeferred(self):
        S, E = [], []
        d = defer.maybeDeferred((lambda x: x + 5), 10)
        d.addCallbacks(S.append, E.append)
        self.assertEquals(E, [])
        self.assertEquals(S, [15])

        S, E = [], []
        try:
            '10' + 5
        except TypeError, e:
            expected = str(e)
        d = defer.maybeDeferred((lambda x: x + 5), '10')
        d.addCallbacks(S.append, E.append)
        self.assertEquals(S, [])
        self.assertEquals(len(E), 1)
        self.assertEquals(str(E[0].value), expected)

        d = defer.Deferred()
        reactor.callLater(0.2, d.callback, 'Success')
        d.addCallback(self.assertEquals, 'Success')
        d.addCallback(self._testMaybeError)
        return d