code: def test_no_plugins(self):
      available_plugins = set(discover_plugins())
      assert available_plugins == set()
  
file_path: allennlp/tests/common/plugins_test.py
imports: from allennlp.commands import Subcommand
  from allennlp.common.plugins import discover_plugins, import_plugins
  from allennlp.common.testing import AllenNlpTestCase
  from allennlp.common.util import pushd
label_desc: Use image node_id 2 for calling the TestPlugins obj's underlying member method code with example usage: obj.test_no_plugins() without return types