code: def test_tag(self):
      self.assertEqual("a", self.scalar("a", 1).value[0].tag)
      self.assertEqual("a/b", self.scalar("a/b", 1).value[0].tag)
  
imports: import glob
  import os
  import numpy
  import tensorflow
  from tensorboard.compat import tf2
  from tensorboard.compat.proto import summary_pb2
  from tensorboard.plugins.scalar import metadata
  from tensorboard.plugins.scalar import summary
  from tensorboard.util import tensor_util
label_desc: Use image node_id 2 for calling the SummaryBaseTest obj's underlying member method code with example usage: obj.test_tag() without return types