code: def setUp(self):
      import hvplot.pandas  # noqa
  
      self.df = pd.DataFrame(
          [[1, 2], [3, 4], [5, 6]], columns=["x", "y"]
      )
  
file_path: hvplot/hvplot/tests/teststreaming.py
imports: from unittest import TestCase
  import pandas
  from holoviews.streams import Buffer, Pipe
label_desc: Use image node_id 1 for calling the TestExplicitStreamPlotting obj's underlying member method code with example usage: obj.setUp() without return types