EN: The second livestream is finished.
        await directLine.emulateIncomingActivity({
          channelData: { streamId: 'a-00002', streamType: 'final' },
          from: { id: 'bot', role: 'bot' },
          id: crypto.randomUUID(),
          text: 'A quick brown fox jumped over the lazy dogs.',
          type: 'message'
        });

        // THEN: Should show message.
        await waitFor(() => expect(pageElements.activities()).toHaveLength(1));
        await waitFor(() =>
          expect(pageElem