code: def test_infer_all_nat(self):
      arr = np.array([NaT, np.nan], dtype=object)
      result, tz = tslib.array_to_datetime(arr, creso=creso_infer)
      assert tz is None
      assert result.dtype == "M8[s]"
  
imports: from datetime import date, datetime, timedelta, timezone
  from dateutil.tz.tz import tzoffset
  import numpy
  import pytest
  from pandas._libs import NaT, iNaT, tslib
  from pandas._libs.tslibs.dtypes import NpyDatetimeUnit
  from pandas._libs.tslibs.np_datetime import OutOfBoundsDatetime
  from pandas import Timestamp
  import pandas._testing
label_desc: Use image node_id 1 for calling the TestArrayToDatetimeResolutionInference obj's underlying member method code with example usage: obj.test_infer_all_nat() without return types