code: def test_frame_datetime64_handling_groupby(self):
      # it works!
      df = DataFrame(
          [
              (3, np.datetime64("2012-07-03")),
              (3, np.datetime64("2012-07-04")),
          ],
          columns=["a", "date"],
      )
      result = df.groupby("a").first()
      assert result["date"][3] == Timestamp("2012-07-03")
  
imports: from datetime import datetime, timedelta
  import numpy
  import pytest
  import pytz
  import pandas
  from pandas import DataFrame, DatetimeIndex, Index, MultiIndex, Series, Timestamp, date_range, offsets
  import pandas._testing
  from pandas.core.groupby.grouper import Grouper
  from pandas.core.groupby.ops import BinGrouper
label_desc: Use image node_id 11 for calling the TestGroupBy obj's underlying member method code with example usage: obj.test_frame_datetime64_handling_groupby() without return types