code: def test_zero_bucket_count(self):
      pb = self.histogram("zero_bucket_count", [1, 1, 1], buckets=0)
      buckets = tensor_util.make_ndarray(pb.value[0].tensor)
      np.testing.assert_array_equal(
          buckets, np.array([]).reshape((0, 3))
      )
  
imports: import glob
  import os
  import numpy
  import tensorflow
  from tensorboard.compat import tf2
  from tensorboard.compat.proto import summary_pb2
  from tensorboard.plugins.histogram import metadata
  from tensorboard.plugins.histogram import summary
  from tensorboard.util import tensor_util
label_desc: Use image node_id 6 for calling the SummaryV2PbTest obj's underlying member method code with example usage: obj.test_zero_bucket_count() without return types