code: def testConflictingNames_WithServe(self):
      with self.assertRaises(ValueError) as cm:
          tb = program.TensorBoard(
              plugins=[core_plugin.CorePluginLoader],
              assets_zip_provider=fake_asset_provider,
              subcommands=[_TestSubcommand(name="serve")],
          )
      self.assertIn("Duplicate subcommand name:", str(cm.exception))
      self.assertIn("serve", str(cm.exception))
  
imports: import argparse
  import io
  import sys
  from unittest import mock
  from tensorboard import program
  from tensorboard import test
  from tensorboard.plugins import base_plugin
  from tensorboard.plugins.core import core_plugin
label_desc: Use image node_id 10 for calling the SubcommandTest obj's underlying member method code with example usage: obj.testConflictingNames_WithServe() without return types