code: def test_is_neighbors_object(estimator, is_neighbor_estimator):
      assert _is_neighbors_object(estimator) == is_neighbor_estimator
  
imports: from collections import Counter, OrderedDict
  import numpy
  import pytest
  from sklearn.cluster import KMeans
  from sklearn.neighbors import NearestNeighbors
  from sklearn.neighbors._base import KNeighborsMixin
  from sklearn.utils._testing import assert_array_equal
  from imblearn.utils import check_neighbors_object, check_sampling_strategy, check_target_type
  from imblearn.utils._validation import ArraysTransformer, _deprecate_positional_args, _is_neighbors_object
  from imblearn.utils.testing import _CustomNearestNeighbors
label_desc: Use image node_id 21 for calling a global function with example usage: test_is_neighbors_object(estimator, is_neighbor_estimator) without return types