code: def test_concat_single_dataframe_tz_aware(copy):
      # https://github.com/pandas-dev/pandas/issues/25257
      df = pd.DataFrame(
          {
              "timestamp": [
                  pd.Timestamp(
                      "2020-04-08 09:00:00.709949+0000", tz="UTC"
                  )
              ]
          }
      )
      expected = df.copy()
      result = pd.concat([df], copy=copy)
      tm.assert_frame_equal(result, expected)
  
file_path: pandas/pandas/tests/dtypes/test_concat.py
imports: import pytest
  import pandas.core.dtypes.concat
  import pandas
  from pandas import Series
  import pandas._testing
label_desc: Use image node_id 2 for calling a global function with example usage: test_concat_single_dataframe_tz_aware(copy) without return types