class_docstr: Tests the TensorBoard program.
code: def testPlugins_pluginClass(self):
      tb = program.TensorBoard(
          plugins=[core_plugin.CorePlugin],
          assets_zip_provider=fake_asset_provider,
      )
      self.assertIsInstance(
          tb.plugin_loaders[0], base_plugin.BasicLoader
      )
      self.assertIs(
          tb.plugin_loaders[0].plugin_class, core_plugin.CorePlugin
      )
  
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 1 for calling the TensorBoardTest obj's underlying member method code with example usage: obj.testPlugins_pluginClass() without return types