code: def ASSET_FINDER_COUNTRY_CODE(cls):
      return cls.DOMAIN.country_code
  
imports: from functools import partial
  import pandas
  from pandas.util.testing import assert_frame_equal
  from zipline.errors import NoFurtherDataError
  from zipline.pipeline import Pipeline, CustomFactor, CustomFilter, CustomClassifier, SimplePipelineEngine
  from zipline.pipeline.data.testing import TestingDataSet
  from zipline.pipeline.domain import CA_EQUITIES, EquitySessionDomain, GB_EQUITIES, US_EQUITIES
  from zipline.pipeline.factors import SimpleMovingAverage
  from zipline.pipeline.filters.smoothing import All
  from zipline.testing import ZiplineTestCase, parameter_space, ExplodingObject
  from zipline.testing.fixtures import WithTradingSessions, WithSeededRandomPipelineEngine, WithAssetFinder
  from zipline.utils.classproperty import classproperty
  from zipline.utils.input_validation import _qualified_name
  from zipline.utils.numpy_utils import int64_dtype
label_desc: Use image node_id 1 for calling the DownsampledPipelineTestCase obj's underlying member method code with example usage: obj.ASSET_FINDER_COUNTRY_CODE(cls) and returns: cls