code: def test_get_value(self):
      panel = self.panel
      reader = self.reader
  
      for asset, date, field in product(*panel.axes):
          self.assertEqual(
              panel.loc[asset, date, field],
              reader.get_value(asset, date, field),
          )
  
file_path: catalyst/tests/test_panel_bar_reader.py
imports: from itertools import permutations, product
  import numpy
  import pandas
  from catalyst.data.us_equity_pricing import PanelBarReader
  from catalyst.testing import ExplodingObject
  from catalyst.testing.fixtures import WithAssetFinder, CatalystTestCase
  from catalyst.utils.calendars import get_calendar
label_desc: Use image node_id 2 for calling the WithPanelBarReader obj's underlying member method code with example usage: obj.test_get_value() without return types