'The C{\'SERVER_PORT\'} key of the C{environ} C{dict} passed to the
application is always a native string.'

def test_serverPortIsNativeString(self):

    (request, result) = self.prepareRequest()
    request.requestReceived()
    result.addCallback(self.environKeyEqual('SERVER_PORT', '80'))
    self.assertIsInstance(self.successResultOf(result), str)
