code: def test_issue_1343():
      """
  
      https://github.com/online-ml/river/issues/1343
  
      """
      rmean = utils.TimeRolling(
          proba.MultivariateGaussian(),
          period=dt.timedelta(microseconds=1),
      )
      t = dt.datetime.utcnow()
      rmean.update({"a": 0}, t=t)
      rmean.update({"a": 1}, t=t)
  
file_path: river/river/utils/test_rolling.py
imports: from __future__ import annotations
  import datetime
  import pytest
  from river import proba, stats, utils
label_desc: Use image node_id 4 for calling a global function with example usage: test_issue_1343() without return types