code: def test_tag(self):
      data = np.array(1, np.uint8, ndmin=4)
      self.assertEqual(
          "a/image_summary", self.image("a", data).value[0].tag
      )
      self.assertEqual(
          "a/b/image_summary", self.image("a/b", data).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.image import metadata
  from tensorboard.plugins.image import summary
label_desc: Use image node_id 2 for calling the SummaryV1OpTest obj's underlying member method code with example usage: obj.test_tag() without return types