devserver.py 文件源码

def start_karma(self):

        logger.info(
            'Starting karma test watcher process from Django runserver command'
        )

        self.karma_process = subprocess.Popen(
            'yarn run test-karma:watch',
            shell=True,
            stdin=subprocess.PIPE,
            stdout=sys.stdout,
            stderr=sys.stderr)

        if self.karma_process.poll() is not None:
            raise CommandError(
                'Karma process failed to start from Django runserver command')

        logger.info(
            'Django Runserver command has spawned a Karma test watcher process on pid {0}'.
            format(self.karma_process.pid))

        self.karma_process.wait()

        if self.karma_process.returncode != 0 and not self.karma_cleanup_closing:
            logger.error("Karma process exited unexpectedly.")