tLine.emulateIncomingActivity({
          from: { id: 'bot', role: 'bot' },
          text: `Bot 2: t=${(clock.Date.now() - 600) / 1_000}s`,
          type: 'message'
        });

        clock.tick(110_000);

        await directLine.emulateIncomingActivity({
          from: { id: 'bot', role: 'bot' },
          text: `Bot 3: t=${(clock.Date.now() - 600) / 1_000}s`,
          type: 'message'
        });

        await directLine.emulateIncomingActivity({
          from: { id: 'user', role: 'user' },
      