class_docstr: Tests the TensorBoard program.
code: def testConfigure_unknownFlag(self):
      tb = program.TensorBoard(
          plugins=[core_plugin.CorePlugin],
          assets_zip_provider=fake_asset_provider,
      )
      with self.assertRaisesRegex(
          ValueError, "Unknown TensorBoard flag"
      ):
          tb.configure(foo="bar")
  
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 6 for calling the TensorBoardTest obj's underlying member method code with example usage: obj.testConfigure_unknownFlag() without return types