'L{default.verifyHostKey} should return a L{Deferred} which fails with
L{HostKeyChanged} if the host key is incorrect.'

def test_verifyBadKey(self):

    d = default.verifyHostKey(self.fakeTransport, '4.3.2.1', otherSampleKey, 'Again,    not    required.')
    return self.assertFailure(d, HostKeyChanged)
