code: def test_example_plugin() -> None:
      a = ExampleRegisteredPlugin(10)
      assert a.add(20) == 30
  
imports: from hydra.core.plugins import Plugins
  from hydra.plugins.plugin import Plugin
  from example_registered_plugin import ExampleRegisteredPlugin, register_example_plugin
label_desc: Use image node_id 2 for calling a global function with example usage: test_example_plugin() without return types