code: def tearDown(self):
      pass
  
file_path: zipline/tests/pipeline/test_frameload.py
imports: from unittest import TestCase
  from mock import patch
  from numpy import arange, ones
  from numpy.testing import assert_array_equal
  from pandas import DataFrame, DatetimeIndex, Int64Index
  from trading_calendars import get_calendar
  from zipline.lib.adjustment import ADD, Float64Add, Float64Multiply, Float64Overwrite, MULTIPLY, OVERWRITE
  from zipline.pipeline.data import USEquityPricing
  from zipline.pipeline.domain import US_EQUITIES
  from zipline.pipeline.loaders.frame import DataFrameLoader
label_desc: Use image node_id 2 for calling the DataFrameLoaderTestCase obj's underlying member method code with example usage: obj.tearDown() without return types