code: def test_normalize_metadata_single_dict():
      assert normalize_metadata({"a": 1}, sources_count=1) == [{"a": 1}]
      assert normalize_metadata({"a": 1}, sources_count=3) == [
          {"a": 1},
          {"a": 1},
          {"a": 1},
      ]
  
imports: import pytest
  from haystack.components.converters.utils import normalize_metadata
label_desc: Use image node_id 2 for calling a global function with example usage: test_normalize_metadata_single_dict() without return types