code: def test_create_chunk_with_only_content():
      chunk = StreamingChunk(content="Test content")
  
      assert chunk.content == "Test content"
      assert chunk.meta == {}
  
imports: import pytest
  from haystack.dataclasses import StreamingChunk
label_desc: Use image node_id 2 for calling a global function with example usage: test_create_chunk_with_only_content() without return types