code: def testWithoutTimezone(self):
      barFeed = self.__loadIntradayBarFeed(None)
      ds = barFeed.getDataSeries()
  
      for i, currentBar in enumerate(ds):
          # Datetime must be set to UTC.
          self.assertFalse(
              dt.datetime_is_naive(currentBar.getDateTime())
          )
          self.assertEqual(ds[i].getDateTime(), ds.getDateTimes()[i])
  
file_path: pyalgotrade/testcases/ninjatraderfeed_test.py
imports: import datetime
  from .None import common
  from .None import barfeed_test
  from .None import feed_test
  from pyalgotrade.barfeed import ninjatraderfeed
  from pyalgotrade import marketsession
  from pyalgotrade import bar
  from pyalgotrade.utils import dt
label_desc: Use image node_id 4 for calling the NinjaTraderTestCase obj's underlying member method code with example usage: obj.testWithoutTimezone() without return types