def test_fromOpenSSLCipherStringExpandsToListOfCiphers(self):
        """
        If L{sslverify.OpenSSLAcceptableCiphers.fromOpenSSLCipherString} is
        called it expands the string to a list of ciphers.
        """
        ac = sslverify.OpenSSLAcceptableCiphers.fromOpenSSLCipherString('ALL')
        self.assertIsInstance(ac._ciphers, list)
        self.assertTrue(all(sslverify.ICipher.providedBy(c)
                            for c in ac._ciphers))

        If L{sslverify.OpenSSLAcceptableCiphers.fromOpenSSLCipherString} is
        called it expands the string to a list of ciphers.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_sslverify.py