code: def assert_micro_cluster_properties(
      cluster, center, last_update=None
  ):
      assert cluster.center == pytest.approx(center)
      if last_update is not None:
          assert cluster.last_update == last_update
  
file_path: river/river/cluster/test_dbstream.py
imports: from __future__ import annotations
  import pytest
  from sklearn.datasets import make_blobs
  from river import metrics, stream, utils
  from river.cluster import DBSTREAM
label_desc: Use image node_id 3 for calling a global function with example usage: assert_micro_cluster_properties(cluster, center, last_update) without return types