code: def testEmptyBucket(self):
      b = reservoir._ReservoirBucket(1)
      self.assertFalse(b.Items())
  
imports: import tensorflow
  from tensorboard.backend.event_processing import reservoir
label_desc: Use image node_id 1 for calling the ReservoirBucketTest obj's underlying member method code with example usage: obj.testEmptyBucket() without return types