code: def testRemovesItems(self):
      b = reservoir._ReservoirBucket(100)
      for i in range(10):
          b.AddItem(i)
      self.assertEqual(len(b.Items()), 10)
      self.assertEqual(b._num_items_seen, 10)
      self.assertEqual(b.FilterItems(lambda x: x <= 7), 2)
      self.assertEqual(len(b.Items()), 8)
      self.assertEqual(b._num_items_seen, 8)
  
imports: import tensorflow
  from tensorboard.backend.event_processing import reservoir
label_desc: Use image node_id 9 for calling the ReservoirBucketTest obj's underlying member method code with example usage: obj.testRemovesItems() without return types