'Evaluate interrupting with CTRL-C.'

def test_ControlC(self):

    done = self.recvlineClient.expect('done')
    self._testwrite((('cancelled    line' + manhole.CTRL_C) + 'done'))
    def finished(ign):
        self._assertBuffer(['>>>    cancelled    line', 'KeyboardInterrupt', '>>>    done'])
    return done.addCallback(finished)
