code: def tstBaseFeedInterface(testCase, feed):
      # This tests the observer.Subject interface.
      disp = dispatcher.Dispatcher()
      disp.addSubject(feed)
      disp.run()
  
      # This tests the feed.BaseFeed interface.
      feed.createDataSeries("any", 10)
      feed.getNextValues()
  
label_desc: Use image node_id 1 for calling a global function with example usage: tstBaseFeedInterface(testCase, feed) without return types