def test_singleShift3(self):
        """
        L{ServerProtocol.singleShift3} writes an escape sequence
        followed by L{C1SevenBit.SS3}
        """
        self.protocol.singleShift3()
        self.assertEqual(self.transport.value(),
                         self.ESC + C1SevenBit.SS3.value)

        L{ServerProtocol.singleShift3} writes an escape sequence
        followed by L{C1SevenBit.SS3}
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/conch/test/test_insults.py