diff --git a/tests/pass_through_unit_tests/test_custom_logger_passthrough.py b/tests/pass_through_unit_tests/test_custom_logger_passthrough.py
new file mode 100644
index 0000000000..90fcc273e1
--- /dev/null
+++ b/tests/pass_through_unit_tests/test_custom_logger_passthrough.py
@@ -0,0 +1,73 @@
+import json
+import os
+import sys
+from datetime import datetime
+from unittest.mock import AsyncMock, Mock, patch, MagicMock
+from typing import Optional
+from fastapi import Request
+import pytest
+import asyncio
+
+sys.path.insert(
+    0, os.path.abspath("../..")
+)  # Adds the parent directory to the system path
+
+import litellm
+from litellm.proxy._types import UserAPIKeyAuth
+from litellm.integrations.custom_logger import CustomLogger
+from litellm.proxy.pass_through_endpoints.pass_through_endpoints import pass_through_request
+
+class TestCustomLogger(CustomLogger):
+    async def async_log_success_event(self, kwargs, response_obj, start_time, end_time):
+        print("in async log success event kwargs", json.dumps(kwargs, indent=4, default=str))
+        pass
+
+@pytest.mark.asyncio
+async def test_assistants_passthrough_logging():
+    test_custom_logger = TestCustomLogger()
+    litellm._async_success_callback = [test_custom_logger]
+
+    result = await pass_through_request(
+        request=Request(
+            scope={
+                "type": "http",
+                "method": "POST",
+                "path": "/v1/assistants",
+                "query_string": b"",
+                "headers": [
+                    (b"content-type", b"application/json"),
+                    (b"authorization", f"Bearer {os.getenv('OPENAI_API_KEY')}".encode()),
+                    (b"openai-beta", b"assistants=v2")
+                ]
+            },
+        ),
+        target="https://api.openai.com/v1/assistants",
+        custom_headers={
+            "Content-Type": "application/json",
+            "Authorization": f"Bearer {os.getenv('OPENAI_API_KEY')}",
+            "OpenAI-Beta": "assistants=v2"
+        },
+        user_api_key_dict=UserAPIKeyAuth(
+            api_key="test",
+            user_id="test",
+            team_id="test",
+            end_user_id="test",
+        ),
+        custom_body={
+            "instructions": "You are a personal math tutor. When asked a question, write and run Python code to answer the question.",
+            "name": "Math Tutor",
+            "tools": [{"type": "code_interpreter"}],
+            "model": "gpt-4o"
+        },
+        forward_headers=False,
+        merge_query_params=False,
+    )
+
+    print("got result", result)
+    print("result status code", result.status_code)
+    print("result content", result.body)
+    
+
+
+    await asyncio.sleep(5)
+