code: def test_get_indexer_requires_unique(self):
      ci = CategoricalIndex(
          list("aabbca"), categories=list("cab"), ordered=False
      )
      oidx = Index(np.array(ci))
  
      msg = "Reindexing only valid with uniquely valued Index objects"
  
      for n in [1, 2, 5, len(ci)]:
          finder = oidx[
              np.random.default_rng(2).integers(0, len(ci), size=n)
          ]
  
          with pytest.raises(InvalidIndexError, match=msg):
              ci.get_indexer(finder)
  
      # see gh-17323
      #
      # Even when indexer is equal to the
      # members in the index, we should
      # respect duplicates instead of taking
      # the fast-track path.
      for finder in [list("aabbca"), list("aababca")]:
          with pytest.raises(InvalidIndexError, match=msg):
              ci.get_indexer(finder)
  
imports: import numpy
  import pytest
  from pandas.errors import InvalidIndexError
  import pandas
  from pandas import CategoricalIndex, Index, IntervalIndex, Timestamp
  import pandas._testing
label_desc: Use image node_id 2 for calling the TestGetIndexer obj's underlying member method code with example usage: obj.test_get_indexer_requires_unique() without return types