code: def test_tdi_total_seconds_all_nat(self):
      # with both nat
      ser = Series([np.nan, np.nan], dtype="timedelta64[ns]")
      result = ser.dt.total_seconds()
      expected = Series([np.nan, np.nan])
      tm.assert_series_equal(result, expected)
  
file_path: pandas/pandas/tests/indexes/timedeltas/test_scalar_compat.py
imports: import numpy
  import pytest
  from pandas._libs.tslibs.offsets import INVALID_FREQ_ERR_MSG
  from pandas import Index, Series, Timedelta, TimedeltaIndex, timedelta_range
  import pandas._testing
label_desc: Use image node_id 2 for calling the TestVectorizedTimedelta obj's underlying member method code with example usage: obj.test_tdi_total_seconds_all_nat() without return types