code: def testNoDrawDown2(self):
      helper = drawdown.DrawDownHelper()
  
      dt = datetime.datetime.now()
      helper.update(dt, 10, 10)
      self.assertEqual(helper.getMaxDrawDown(), 0)
      self.assertEqual(helper.getCurrentDrawDown(), 0)
      self.assertEqual(helper.getDuration(), datetime.timedelta())
  
      dt += datetime.timedelta(days=1)
      helper.update(dt, 10.01, 10.01)
      self.assertEqual(helper.getMaxDrawDown(), 0)
      self.assertEqual(helper.getCurrentDrawDown(), 0)
      self.assertEqual(helper.getDuration(), datetime.timedelta())
  
      dt += datetime.timedelta(days=1)
      helper.update(dt, 11, 11)
      self.assertEqual(helper.getMaxDrawDown(), 0)
      self.assertEqual(helper.getCurrentDrawDown(), 0)
      self.assertEqual(helper.getDuration(), datetime.timedelta())
  
imports: import datetime
  from .None import common
  from .None import strategy_test
  from pyalgotrade.barfeed import yahoofeed
  from pyalgotrade.barfeed import membf
  from pyalgotrade.stratanalyzer import drawdown
  from pyalgotrade import broker
  from pyalgotrade import bar
label_desc: Use image node_id 2 for calling the DDHelperCase obj's underlying member method code with example usage: obj.testNoDrawDown2() without return types