code: def test_get_loc_nat(self):
      # GH#20464
      index = DatetimeIndex(["1/3/2000", "NaT"])
      assert index.get_loc(pd.NaT) == 1
  
      assert index.get_loc(None) == 1
  
      assert index.get_loc(np.nan) == 1
  
      assert index.get_loc(pd.NA) == 1
  
      assert index.get_loc(np.datetime64("NaT")) == 1
  
      with pytest.raises(KeyError, match="NaT"):
          index.get_loc(np.timedelta64("NaT"))
  
imports: from datetime import date, datetime, time, timedelta
  import numpy
  import pytest
  from pandas._libs import index
  from pandas.compat.numpy import np_long
  import pandas
  from pandas import DatetimeIndex, Index, Timestamp, bdate_range, date_range, notna
  import pandas._testing
  from pandas.tseries.frequencies import to_offset
label_desc: Use image node_id 6 for calling the TestGetLoc obj's underlying member method code with example usage: obj.test_get_loc_nat() without return types