code: def test_databricks_notebook_run_context_tags_nones():
      assert DatabricksClusterRunContext().tags() == {}
  
imports: from unittest import mock
  from mlflow.tracking.context.databricks_cluster_context import DatabricksClusterRunContext
  from mlflow.utils.mlflow_tags import MLFLOW_DATABRICKS_CLUSTER_ID
label_desc: Use image node_id 3 for calling a global function with example usage: test_databricks_notebook_run_context_tags_nones() without return types