code: def test_shift_empty(self):
      # Regression test for GH#8019
      df = DataFrame({"foo": []})
      rs = df.shift(-1)
  
      tm.assert_frame_equal(df, rs)
  
imports: import numpy
  import pytest
  import pandas
  from pandas import CategoricalIndex, DataFrame, Index, NaT, Series, date_range, offsets
  import pandas._testing
label_desc: Use image node_id 24 for calling the TestDataFrameShift obj's underlying member method code with example usage: obj.test_shift_empty() without return types