code: def testBOP(self):
      barDs = self.__loadBarDS()
      self.assertAmountsAreEqual(indicator.BOP(barDs, 252)[0], -0.40)
      self.assertAmountsAreEqual(indicator.BOP(barDs, 252)[1], 0.94)
  
imports: import datetime
  import talib
  from six.moves import xrange
  from .None import common
  from pyalgotrade.talibext import indicator
  from pyalgotrade import bar
  from pyalgotrade import dataseries
  from pyalgotrade.dataseries import bards
label_desc: Use image node_id 16 for calling the TestCase obj's underlying member method code with example usage: obj.testBOP() without return types