How to use the @xviz/parser.LOG_STREAM_MESSAGE.METADATA function in @xviz/parser

loader.connect().then(() => {
    t.ok(loader.isOpen(), 'socket connected');
    const {socket} = loader;
    t.is(socket.url, 'http://localhost:3000?profile=default', 'socket connected to correct url');
    t.deepEquals(socket.flush(), [], 'No data till metadata');

    // Mock metadata
    loader.onXVIZMessage({type: LOG_STREAM_MESSAGE.METADATA, data: {version: '2.0.0'}});
    t.deepEquals(socket.flush(), [], 'No client request after metadata');

    loader.seek(1005);
    t.deepEquals(socket.flush(), [], 'seek: no socket updates');

    loader.onXVIZMessage({type: LOG_STREAM_MESSAGE.TIMESLICE, timestamp: 1007});
    loader.onXVIZMessage({type: LOG_STREAM_MESSAGE.TIMESLICE, timestamp: 1008});
    loader.onXVIZMessage({type: LOG_STREAM_MESSAGE.TIMESLICE, timestamp: 1009});
    loader.onXVIZMessage({type: LOG_STREAM_MESSAGE.TIMESLICE, timestamp: 1010});

    // t.deepEquals(loader.getBufferRange(), [[1, 2]], 'BufferRange includes all messages');

    setXVIZConfig(oldConfig);
    t.end();
  });
});

loader.connect().then(() => {
    t.ok(loader.isOpen(), 'socket connected');
    const {socket} = loader;
    t.is(socket.url, 'http://localhost:3000?profile=default', 'socket connected to correct url');
    t.deepEquals(socket.flush(), [], 'No data till metadata');

    // Mock metadata with missing start_time
    loader.onXVIZMessage({type: LOG_STREAM_MESSAGE.METADATA});
    t.deepEquals(socket.flush(), [], 'No client request after metadata');

    loader.onXVIZMessage({type: LOG_STREAM_MESSAGE.TIMESLICE, timestamp: 1007});

    loader.seek(1007);
    t.deepEquals(socket.flush(), [], 'seek: no socket updates');

    t.equals(
      loader.getBufferStartTime(),
      987,
      'getBufferStartTime() based on first message - 30/3 * 2 preBuffer'
    );
    t.equals(
      loader.getBufferEndTime(),
      1017,
      'getBufferEndTime() based on first message + 30/3 = 10 postBuffer'

loader.connect().then(() => {
    t.ok(loader.isOpen(), 'socket connected');
    const {socket} = loader;
    t.is(
      socket.url,
      'http://localhost:3000?log=test_log&profile=default&duration=30',
      'socket connected to correct url'
    );
    t.deepEquals(socket.flush(), [], 'No data till metadata');

    // Mock metadata
    loader.onXVIZMessage({type: LOG_STREAM_MESSAGE.METADATA, start_time: 1000, end_time: 1030});
    t.deepEquals(
      socket.flush(),
      [{type: 'xviz/transform_log', data: {start_timestamp: 1000, end_timestamp: 1010, id: '0'}}],
      'transform_log: update with correct parameters'
    );

    loader.seek(1005);
    t.deepEquals(socket.flush(), [], 'seek: no socket updates');

    loader.seek(1012);
    t.deepEquals(
      socket.flush(),
      [{type: 'xviz/transform_log', data: {start_timestamp: 1007, end_timestamp: 1017, id: '1'}}],
      'seek: update with correct parameters'
    );

onXVIZMessage = message => {
    switch (message.type) {
      case LOG_STREAM_MESSAGE.METADATA:
        this._onXVIZMetadata(message);
        this.emit('ready', message);
        break;

      case LOG_STREAM_MESSAGE.TIMESLICE:
        this._onXVIZTimeslice(message);
        this.emit('update', message);
        break;

      case LOG_STREAM_MESSAGE.DONE:
        this.emit('finish', message);
        break;

      default:
        this.emit('error', message);
    }