code: def test_where_none_nan_coerce():
      # GH 15613
      expected = DataFrame(
          {
              "A": [
                  Timestamp("20130101"),
                  pd.NaT,
                  Timestamp("20130103"),
              ],
              "B": [1, 2, np.nan],
          }
      )
      result = expected.where(expected.notnull(), None)
      tm.assert_frame_equal(result, expected)
  
imports: from datetime import datetime
  from hypothesis import given
  import numpy
  import pytest
  from pandas.core.dtypes.common import is_scalar
  import pandas
  from pandas import DataFrame, DatetimeIndex, Index, Series, StringDtype, Timestamp, date_range, isna
  import pandas._testing
  from pandas._testing._hypothesis import OPTIONAL_ONE_OF_ALL
label_desc: Use image node_id 7 for calling a global function with example usage: test_where_none_nan_coerce() without return types