def test_cursorBackward(self):
        """
        L{ServerProtocol.cursorBackward} writes the control sequence
        ending with L{CSFinalByte.CUB} to its transport.
        """
        self.protocol.cursorBackward(1)
        self.assertEqual(self.transport.value(),
                         self.CSI + b'1' + CSFinalByte.CUB.value)

        L{ServerProtocol.cursorBackward} writes the control sequence
        ending with L{CSFinalByte.CUB} to its transport.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/conch/test/test_insults.py