def test_doesNotStumbleOverEmptyList(self):
        """
        If the expanded cipher list is empty, an empty L{list} is returned.
        """
        self.assertEqual(
            [],
            sslverify._expandCipherString(u'', SSL.SSLv23_METHOD, 0)
        )

        If the expanded cipher list is empty, an empty L{list} is returned.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_sslverify.py