code: def test_get_loc_with_values_including_missing_values(self):
      # issue 19132
      idx = MultiIndex.from_product([[np.nan, 1]] * 2)
      expected = slice(0, 2, None)
      assert idx.get_loc(np.nan) == expected
  
      idx = MultiIndex.from_arrays([[np.nan, 1, 2, np.nan]])
      expected = np.array([True, False, False, True])
      tm.assert_numpy_array_equal(idx.get_loc(np.nan), expected)
  
      idx = MultiIndex.from_product([[np.nan, 1]] * 3)
      expected = slice(2, 4, None)
      assert idx.get_loc((np.nan, 1)) == expected
  
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 9 for calling the TestGetLoc obj's underlying member method code with example usage: obj.test_get_loc_with_values_including_missing_values() without return types