  const firstTypingActivityId = 't-00001';

        await directLine.emulateIncomingActivity({
          channelData: { streamSequence: 1, streamType: 'streaming' },
          from: { id: 'u-00001', name: 'Bot', role: 'bot' },
          id: firstTypingActivityId,
          text: 'A quick',
          timestamp: 1,
          type: 'typing'
        });

        let secondActivityKey = currentActivityKeysWithId[1][0];

        // THEN: Should display 2 messages.
        await pageConditions.numActivitiesShown(2