def pipe(self):
        """
        Fake C{os.pipe}. Return non fd numbers to be sure it's not used
        elsewhere, and increment C{self.pipeCount}. This is used to uniquify
        the result.
        """
        self.pipeCount += 1
        return - 2 * self.pipeCount + 1,  - 2 * self.pipeCount

        Fake C{os.pipe}. Return non fd numbers to be sure it's not used
        elsewhere, and increment C{self.pipeCount}. This is used to uniquify
        the result.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_process.py