code: def test_first_strings_timestamps():
      # GH 11244
      test = DataFrame(
          {
              Timestamp("2012-01-01 00:00:00"): ["a", "b"],
              Timestamp("2012-01-02 00:00:00"): ["c", "d"],
              "name": ["e", "e"],
              "aaaa": ["f", "g"],
          }
      )
      result = test.groupby("name").first()
      expected = DataFrame(
          [["a", "c", "f"]],
          columns=Index(
              [Timestamp("2012-01-01"), Timestamp("2012-01-02"), "aaaa"]
          ),
          index=Index(["e"], name="name"),
      )
      tm.assert_frame_equal(result, expected)
  
imports: import numpy
  import pytest
  import pandas
  from pandas import DataFrame, Index, MultiIndex, Series, Timestamp, isna
  import pandas._testing
label_desc: Use image node_id 9 for calling a global function with example usage: test_first_strings_timestamps() without return types