code: def test_get_indexer(self):
      major_axis = Index(np.arange(4))
      minor_axis = Index(np.arange(2))
  
      major_codes = np.array([0, 0, 1, 2, 2, 3, 3], dtype=np.intp)
      minor_codes = np.array([0, 1, 0, 0, 1, 0, 1], dtype=np.intp)
  
      index = MultiIndex(
          levels=[major_axis, minor_axis],
          codes=[major_codes, minor_codes],
      )
      idx1 = index[:5]
      idx2 = index[[1, 3, 5]]
  
      r1 = idx1.get_indexer(idx2)
      tm.assert_almost_equal(r1, np.array([1, 3, -1], dtype=np.intp))
  
      r1 = idx2.get_indexer(idx1, method="pad")
      e1 = np.array([-1, 0, 0, 1, 1], dtype=np.intp)
      tm.assert_almost_equal(r1, e1)
  
      r2 = idx2.get_indexer(idx1[::-1], method="pad")
      tm.assert_almost_equal(r2, e1[::-1])
  
      rffill1 = idx2.get_indexer(idx1, method="ffill")
      tm.assert_almost_equal(r1, rffill1)
  
      r1 = idx2.get_indexer(idx1, method="backfill")
      e1 = np.array([0, 0, 1, 1, 2], dtype=np.intp)
      tm.assert_almost_equal(r1, e1)
  
      r2 = idx2.get_indexer(idx1[::-1], method="backfill")
      tm.assert_almost_equal(r2, e1[::-1])
  
      rbfill1 = idx2.get_indexer(idx1, method="bfill")
      tm.assert_almost_equal(r1, rbfill1)
  
      # pass non-MultiIndex
      r1 = idx1.get_indexer(idx2.values)
      rexp1 = idx1.get_indexer(idx2)
      tm.assert_almost_equal(r1, rexp1)
  
      r1 = idx1.get_indexer([1, 2, 3])
      assert (r1 == [-1, -1, -1]).all()
  
      # create index with duplicates
      idx1 = Index(list(range(10)) + list(range(10)))
      idx2 = Index(list(range(20)))
  
      msg = "Reindexing only valid with uniquely valued Index objects"
      with pytest.raises(InvalidIndexError, match=msg):
          idx1.get_indexer(idx2)
  
imports: from datetime import timedelta
  import re
  import numpy
  import pytest
  from pandas._libs import index
  from pandas.errors import InvalidIndexError, PerformanceWarning
  import pandas
  from pandas import Categorical, DataFrame, Index, MultiIndex, date_range
  import pandas._testing
label_desc: Use image node_id 1 for calling the TestGetIndexer obj's underlying member method code with example usage: obj.test_get_indexer() without return types