 THEN: Should show no messages.
        await waitFor(() => expect(pageElements.activities()).toHaveLength(0));

        // THEN: Should match snapshot.
        await host.snapshot('local');

        // ---

        // WHEN: Receive another chunk livestream.
        await directLine.emulateIncomingActivity({
          channelData: { streamSequence: 1, streamType: 'streaming' },
          from: { id: 'bot', role: 'bot' },
          id: 'a-00002',
          text: 'A quick brown fox',
          type: 'typing'
