fixtures.py 文件源码

def setUp(self):
        super(DisplayFixture, self).setUp()
        self.process = Popen(self.command, stdin=PIPE, stdout=PIPE)
        self.display = self.process.stdout.readline().decode("ascii").strip()
        if not self.display or self.process.poll() is not None:
            raise CalledProcessError(self.process.returncode, self.command)
        self.useFixture(EnvironmentVariable("DISPLAY", self.display))
        self.addCleanup(self.shutdown)