fix(huggingface): add stream_usage support for ChatHuggingFace invoke/stream (#32708)

libs/partners/huggingface/tests/integration_tests/test_chat_models.py

@@ -0,0 +1,22 @@
+from langchain_core.messages import AIMessageChunk
+
+from langchain_huggingface import ChatHuggingFace, HuggingFaceEndpoint
+
+
+def test_stream_usage() -> None:
+    """Test we are able to configure stream options on models that require it."""
+    llm = HuggingFaceEndpoint(  # type: ignore[call-arg]  # (model is inferred in class)
+        repo_id="google/gemma-3-27b-it",
+        task="conversational",
+        provider="nebius",
+    )
+
+    model = ChatHuggingFace(llm=llm, stream_usage=True)
+
+    full: AIMessageChunk | None = None
+    for chunk in model.stream("hello"):
+        assert isinstance(chunk, AIMessageChunk)
+        full = chunk if full is None else full + chunk
+
+    assert isinstance(full, AIMessageChunk)
+    assert full.usage_metadata