code: def test_get_indexer_array(self):
      arr = np.array(
          [
              Timestamp("1999-12-31 00:00:00"),
              Timestamp("2000-12-31 00:00:00"),
          ],
          dtype=object,
      )
      cats = [
          Timestamp("1999-12-31 00:00:00"),
          Timestamp("2000-12-31 00:00:00"),
      ]
      ci = CategoricalIndex(
          cats, categories=cats, ordered=False, dtype="category"
      )
      result = ci.get_indexer(arr)
      expected = np.array([0, 1], dtype="intp")
      tm.assert_numpy_array_equal(result, expected)
  
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 5 for calling the TestGetIndexer obj's underlying member method code with example usage: obj.test_get_indexer_array() without return types