code: def test_convert_df_series_to_panel():
      """Test output format of series-to-panel for dataframe type input."""
      X_series = _make_series(n_columns=2, return_mtype="pd.DataFrame")
  
      X_panel = convert_Series_to_Panel(X_series)
  
      assert isinstance(X_panel, list)
      assert isinstance(X_panel[0], pd.DataFrame)
      assert X_panel[0].equals(X_series)
  
file_path: sktime/sktime/datatypes/tests/test_series_to_panel_converters.py
imports: import numpy
  import pandas
  from sktime.datatypes._series_as_panel import convert_Panel_to_Series, convert_Series_to_Panel
  from sktime.utils._testing.panel import _make_panel
  from sktime.utils._testing.series import _make_series
label_desc: Use image node_id 3 for calling a global function with example usage: test_convert_df_series_to_panel() without return types