code: def test_different_null_objects(self):
      # GH#45263
      ser = Series([1, 2, 3, 4], [True, None, np.nan, pd.NaT])
      result = repr(ser)
      expected = (
          "True    1\nNone    2\nNaN     3\nNaT     4\ndtype: int64"
      )
      assert result == expected
  
imports: from datetime import datetime, timedelta
  import numpy
  import pytest
  from pandas._config import using_pyarrow_string_dtype
  import pandas
  from pandas import Categorical, DataFrame, Index, Series, date_range, option_context, period_range, timedelta_range
  import pandas._testing
label_desc: Use image node_id 27 for calling the TestSeriesRepr obj's underlying member method code with example usage: obj.test_different_null_objects() without return types