code: def test_implprefix_warning(recwarn):
      PluginManager(hookspec.project_name, "hello_")
      w = recwarn.pop(DeprecationWarning)
      assert "test_pluginmanager.py" in w.filename
  
imports: import pytest
  import types
  from pluggy import PluginManager, PluginValidationError, HookCallError, HookimplMarker, HookspecMarker
  from pluggy.manager import importlib_metadata
label_desc: Use image node_id 24 for calling a global function with example usage: test_implprefix_warning(recwarn) without return types