test(rust): add live Bedrock messages bridge call

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/test_litellm/anthropic_interface/test_rust_bridge_messages.py

@@ -1,6 +1,7 @@
 """Tests for the optional Rust-backed Anthropic Messages path."""
 
 import importlib
+import os
 from typing import cast
 
 import httpx
@@ -122,6 +123,29 @@ def test_load_rust_messages_returns_injected_impl():
     assert rust_messages.load_rust_messages() is bridge
 
 
+@pytest.mark.asyncio
+async def test_bedrock_invoke_uses_native_rust_bridge():
+    model = os.getenv(
+        "BEDROCK_MODEL",
+        "us.anthropic.claude-sonnet-4-5-20250929-v1:0",
+    )
+
+    response = await litellm.anthropic.messages.acreate(
+        model=f"bedrock/{model}",
+        messages=[{"role": "user", "content": "Reply with one word: hello"}],
+        max_tokens=32,
+        api_key=os.getenv("AWS_BEARER_TOKEN_BEDROCK"),
+        aws_region_name=os.getenv("AWS_REGION_NAME", "us-west-2"),
+        rust=True,
+    )
+
+    assert response["type"] == "message"
+    assert response["role"] == "assistant"
+    assert response["content"][0]["type"] == "text"
+    assert response["content"][0]["text"].strip()
+    assert response["_hidden_params"]["additional_headers"]["x-litellm-rust"] == "true"
+
+
 def test_configuring_messages_does_not_enable_ocr():
     from litellm.rust_bridge.ocr import rust_ocr_enabled