code: def testSMACrossOver(self):
      files = []
      for year in range(2011, 2013):
          for symbol in ["AAPL"]:
              fileName = "WIKI-%s-%d-quandl.csv" % (symbol, year)
              files.append(os.path.join("samples", "data", fileName))
  
      with common.CopyFiles(files, "."):
          code = """import sys
  sys.path.append('samples')
  import sma_crossover_sample
  sma_crossover_sample.main(False)
  """
          res = common.run_python_code(code)
  
          self.assertTrue(res.exit_ok())
          self.assertEqual(
              res.get_output_lines()[-1:],
              common.tail_file("sma_crossover.output", 1),
          )
  
imports: import os
  import six
  from testcases import common
label_desc: Use image node_id 3 for calling the SampleStratTestCase obj's underlying member method code with example usage: obj.testSMACrossOver() without return types