code: def testSizeRequirement(self):
      with self.assertRaises(ValueError):
          reservoir._ReservoirBucket(-1)
      with self.assertRaises(ValueError):
          reservoir._ReservoirBucket(10.3)
  
imports: import tensorflow
  from tensorboard.backend.event_processing import reservoir
label_desc: Use image node_id 8 for calling the ReservoirBucketTest obj's underlying member method code with example usage: obj.testSizeRequirement() without return types