code: def test_warning(self):
      @require_pkg(pkg_name="test123", raise_error=False)
      def test_func(x):
          return x
  
      test_func(x=None)
  
file_path: MONAI/tests/test_require_pkg.py
imports: from __future__ import annotations
  import unittest
  from monai.utils import OptionalImportError, min_version, require_pkg
label_desc: Use image node_id 3 for calling the TestRequirePkg obj's underlying member method code with example usage: obj.test_warning() and returns: x