Added LiteLLM to the stack

Development/litellm/tests/test_litellm/passthrough/test_passthrough_main.py

@@ -0,0 +1,47 @@
+import json
+import os
+import sys
+
+import pytest
+from fastapi.testclient import TestClient
+
+sys.path.insert(
+    0, os.path.abspath("../../..")
+)  # Adds the parent directory to the system path
+
+
+from unittest.mock import MagicMock, patch
+
+import litellm
+from litellm.passthrough.main import llm_passthrough_route
+
+
+def test_llm_passthrough_route():
+    from litellm.llms.custom_httpx.http_handler import HTTPHandler
+
+    client = HTTPHandler()
+
+    with patch.object(
+        client.client,
+        "send",
+        return_value=MagicMock(status_code=200, json={"message": "Hello, world!"}),
+    ) as mock_post:
+        response = llm_passthrough_route(
+            model="vllm/anthropic.claude-3-5-sonnet-20240620-v1:0",
+            endpoint="v1/chat/completions",
+            method="POST",
+            request_url="http://localhost:8000/v1/chat/completions",
+            api_base="http://localhost:8090",
+            json={
+                "model": "my-custom-model",
+                "messages": [{"role": "user", "content": "Hello, world!"}],
+            },
+            client=client,
+        )
+
+        mock_post.call_args.kwargs[
+            "request"
+        ].url == "http://localhost:8090/v1/chat/completions"
+
+        assert response.status_code == 200
+        assert response.json == {"message": "Hello, world!"}