code: def testBuyAndSellBreakEvenWithCommission(self):
      posTracker = returns.PositionTracker(broker.IntegerTraits())
      # self.assertEqual(posTracker.getCash(), 0)
      posTracker.buy(1, 10, 0.01)
      # self.assertEqual(posTracker.getCash(), -10.01)
      self.assertEqual(posTracker.getAvgPrice(), 10)
      posTracker.sell(1, 10.02, 0.01)
      # self.assertEqual(round(posTracker.getCash(), 2), 0)
      self.assertEqual(posTracker.getAvgPrice(), 0)
      # We need to round to avoid floating point errors.
      # The same issue can be reproduced with this piece of code:
      # a = 10.02 - 10
      # b = 0.02
      # print a - b
      # print a - b == 0
      self.assertEqual(posTracker.getPosition(), 0)
      self.assertEqual(round(posTracker.getPnL(), 2), 0)
      self.assertEqual(round(posTracker.getReturn(), 2), 0)
  
imports: import datetime
  from .None import common
  from .None import strategy_test
  from .None import position_test
  from testcases import test_strategy
  from pyalgotrade.barfeed import yahoofeed
  from pyalgotrade.barfeed import csvfeed
  from pyalgotrade.stratanalyzer import returns
  from pyalgotrade import broker
  from pyalgotrade import marketsession
label_desc: Use image node_id 2 for calling the PosTrackerTestCase obj's underlying member method code with example usage: obj.testBuyAndSellBreakEvenWithCommission() without return types