code: def testCompInv_1(self):
      files = [
          os.path.join("samples", "data", src)
          for src in [
              "WIKI-IBM-2011-quandl.csv",
              "WIKI-AES-2011-quandl.csv",
              "WIKI-AIG-2011-quandl.csv",
              "WIKI-ORCL-2011-quandl.csv",
          ]
      ]
  
      with common.CopyFiles(files, "."):
          res = common.run_sample_module("compinv-1")
  
          self.assertTrue(res.exit_ok())
          # Skip the first two lines that have debug messages from the broker.
          lines = res.get_output_lines()
          self.assertEqual(
              lines, common.head_file("compinv-1.output", len(lines))
          )
  
imports: import os
  import six
  from testcases import common
label_desc: Use image node_id 1 for calling the CompInvTestCase obj's underlying member method code with example usage: obj.testCompInv_1() without return types