code: def test_overwrite_metadata():
      t = Trace("test", metadata={"old": "metadata"})
      t.metadata = {"new": "metadata"}
      assert t.metadata == {"old": "metadata", "new": "metadata"}
  
imports: import time
  import pytest
  from wandb.sdk.data_types.trace_tree import Span, SpanKind, StatusCode, Trace
label_desc: Use image node_id 19 for calling a global function with example usage: test_overwrite_metadata() without return types