code: def testEmtpy(self):
      barFeed = barfeed.OptimizerBarFeed(
          bar.Frequency.DAY, ["orcl"], []
      )
      self.assertEquals(barFeed.barsHaveAdjClose(), False)
  
file_path: pyalgotrade/testcases/barfeed_test.py
imports: import datetime
  from .None import common
  from pyalgotrade import barfeed
  from pyalgotrade.barfeed import common
  from pyalgotrade import bar
  from pyalgotrade import dispatcher
label_desc: Use image node_id 4 for calling the OptimizerBarFeedTestCase obj's underlying member method code with example usage: obj.testEmtpy() without return types