code: def test_callback_handler_serialization_non_local():
      result = serialize_callback_handler(default_streaming_callback)
      assert (
          result
          == "haystack.components.generators.utils.default_streaming_callback"
      )
  
imports: import pytest
  from haystack.components.generators.utils import default_streaming_callback
  from haystack.components.generators.utils import serialize_callback_handler, deserialize_callback_handler
label_desc: Use image node_id 3 for calling a global function with example usage: test_callback_handler_serialization_non_local() without return types