code: def test_rsl_hierarchy():
      clusterer = RobustSingleLinkage().fit(X)
      assert clusterer.cluster_hierarchy_ is not None
  
imports: import numpy
  from scipy.spatial import distance
  from scipy import sparse
  from sklearn.utils.estimator_checks import check_estimator
  from sklearn.utils._testing import assert_array_equal, assert_raises
  from hdbscan import RobustSingleLinkage, robust_single_linkage
  from sklearn import datasets
  import warnings
  from sklearn.datasets import make_blobs
  from sklearn.utils import shuffle
  from sklearn.preprocessing import StandardScaler
  import pytest
label_desc: Use image node_id 8 for calling a global function with example usage: test_rsl_hierarchy() without return types