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# Copyright (c) 2006 Twisted Matrix Laboratories.
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# See LICENSE for details.
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from twisted.trial import unittest
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from twisted.names import dns, cache
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class Caching(unittest.TestCase):
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c = cache.CacheResolver({
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dns.Query(name='example.com', type=dns.MX, cls=dns.IN): (time.time(), ([], [], []))})
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return c.lookupMailExchange('example.com').addCallback(self.assertEquals, ([], [], []))