code: def init_class_fixtures(cls):
      super(USEquityPricingLoaderTestCase, cls).init_class_fixtures()
      cls.sids = TEST_QUERY_SIDS
      cls.asset_info = EQUITY_INFO
  
imports: from nose_parameterized import parameterized
  from numpy import arange, datetime64, float64, ones, uint32
  from numpy.testing import assert_allclose, assert_array_equal
  from pandas import concat, DataFrame, Int64Index, Timestamp
  from pandas.util.testing import assert_frame_equal
  from toolz.curried.operator import getitem
  from zipline.lib.adjustment import Float64Multiply
  from zipline.pipeline.domain import US_EQUITIES
  from zipline.pipeline.loaders.synthetic import NullAdjustmentReader, make_bar_data, expected_bar_values_2d
  from zipline.pipeline.loaders.equity_pricing_loader import USEquityPricingLoader
  from zipline.errors import WindowLengthTooLong
  from zipline.pipeline.data import USEquityPricing
  from zipline.testing import seconds_to_timestamp, str_to_seconds, MockDailyBarReader
  from zipline.testing.fixtures import WithAdjustmentReader, ZiplineTestCase
label_desc: Use image node_id 7 for calling the USEquityPricingLoaderTestCase obj's underlying member method code with example usage: obj.init_class_fixtures(cls) without return types