code: def test_get_indexer_nan(self):
      # GH#7820
      result = Index([1, 2, np.nan], dtype=np.float64).get_indexer(
          [np.nan]
      )
      expected = np.array([2], dtype=np.intp)
      tm.assert_numpy_array_equal(result, expected)
  
imports: import numpy
  import pytest
  from pandas.errors import InvalidIndexError
  from pandas import NA, Index, RangeIndex, Series, Timestamp
  import pandas._testing
  from pandas.core.arrays import ArrowExtensionArray, FloatingArray
label_desc: Use image node_id 12 for calling the TestGetIndexer obj's underlying member method code with example usage: obj.test_get_indexer_nan() without return types