code: def testCapacityGreaterThanRequested(self):
      self.assertGreaterEqual(len(self._tree.nodes[-1]), 100)
  
imports: import random
  import unittest
  from reagent.replay_memory import sum_tree
label_desc: Use image node_id 7 for calling the SumTreeTest obj's underlying member method code with example usage: obj.testCapacityGreaterThanRequested() without return types