def test_methodIsDeprecated(self):
        """
        Passing C{method} to L{sslverify.OpenSSLCertificateOptions} is
        deprecated.
        """
        sslverify.OpenSSLCertificateOptions(
            privateKey=self.sKey,
            certificate=self.sCert,
            method=SSL.SSLv23_METHOD,
        )

        message = ("Passing method to twisted.internet.ssl.CertificateOptions "
                   "was deprecated in Twisted 17.1.0. Please use a "
                   "combination of insecurelyLowerMinimumTo, raiseMinimumTo, "
                   "and lowerMaximumSecurityTo instead, as Twisted will "
                   "correctly configure the method.")

        warnings = self.flushWarnings([self.test_methodIsDeprecated])
        self.assertEqual(1, len(warnings))
        self.assertEqual(DeprecationWarning, warnings[0]['category'])
        self.assertEqual(message, warnings[0]['message'])

        Passing C{method} to L{sslverify.OpenSSLCertificateOptions} is
        deprecated.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_sslverify.py