Method set_sync

std/src/testutils.rs:438–448

(&mut self, enabled: bool)

    }

    fn set_sync(&mut self, enabled: bool) -> io::Result<bool> {
        let mut previous = true;
        for o in self.captured_out.iter().rev() {
            if let CapturedOut::SetSync(e) = o {
                previous = *e;
                break;
            }
        }
        self.captured_out.push(CapturedOut::SetSync(enabled));
        Ok(previous)
    }

    async fn play_tone(&mut self, tone: Tone) -> io::Result<()> {
        self.captured_out.push(CapturedOut::PlayTone(tone));