code: def test_pickle(self, float_string_frame, timezone_frame):
      empty_frame = DataFrame()
  
      unpickled = tm.round_trip_pickle(float_string_frame)
      tm.assert_frame_equal(float_string_frame, unpickled)
  
      # buglet
      float_string_frame._mgr.ndim
  
      # empty
      unpickled = tm.round_trip_pickle(empty_frame)
      repr(unpickled)
  
      # tz frame
      unpickled = tm.round_trip_pickle(timezone_frame)
      tm.assert_frame_equal(timezone_frame, unpickled)
  
imports: from datetime import datetime, timedelta
  import itertools
  import numpy
  import pytest
  from pandas.errors import PerformanceWarning
  import pandas
  from pandas import Categorical, DataFrame, Series, Timestamp, date_range, option_context
  import pandas._testing
  from pandas.core.internals.blocks import NumpyBlock
label_desc: Use image node_id 11 for calling the TestDataFrameBlockInternals obj's underlying member method code with example usage: obj.test_pickle(float_string_frame, timezone_frame) without return types