code: def testMaintainsOrder(self):
      b = reservoir._ReservoirBucket(100)
      for i in range(10000):
          b.AddItem(i)
      items = b.Items()
      prev = -1
      for item in items:
          self.assertTrue(item > prev)
          prev = item
  
imports: import tensorflow
  from tensorboard.backend.event_processing import reservoir
label_desc: Use image node_id 4 for calling the ReservoirBucketTest obj's underlying member method code with example usage: obj.testMaintainsOrder() without return types