fix(test): update test_chat_completion to handle metadata in body

The proxy now adds metadata to the request body during processing.
Updated test to compare fields individually and strip metadata from
body comparison.

Fixes litellm_proxy_unit_testing_part2 CI failure.

tests/proxy_unit_tests/test_proxy_custom_logger.py

@@ -192,23 +192,23 @@ def test_chat_completion(client):
         assert "authorization" not in proxy_server_request_object["headers"]
         # Remove arrival_time from comparison as it's dynamic
         proxy_server_request_copy = {k: v for k, v in proxy_server_request_object.items() if k != "arrival_time"}
-        assert proxy_server_request_copy == {
-            "url": "http://testserver/chat/completions",
-            "method": "POST",
-            "headers": {
-                "host": "testserver",
-                "accept": "*/*",
-                "accept-encoding": "gzip, deflate, zstd",
-                "connection": "keep-alive",
-                "user-agent": "testclient",
-                "content-length": "115",
-                "content-type": "application/json",
-            },
-            "body": {
-                "model": "Azure OpenAI GPT-4 Canada",
-                "messages": [{"role": "user", "content": "write a litellm poem"}],
-                "max_tokens": 10,
-            },
+        # Body now includes metadata added during proxy processing - strip it for comparison
+        body_copy = {k: v for k, v in proxy_server_request_copy.get("body", {}).items() if k != "metadata"}
+        assert proxy_server_request_copy["url"] == "http://testserver/chat/completions"
+        assert proxy_server_request_copy["method"] == "POST"
+        assert proxy_server_request_copy["headers"] == {
+            "host": "testserver",
+            "accept": "*/*",
+            "accept-encoding": "gzip, deflate, zstd",
+            "connection": "keep-alive",
+            "user-agent": "testclient",
+            "content-length": "115",
+            "content-type": "application/json",
+        }
+        assert body_copy == {
+            "model": "Azure OpenAI GPT-4 Canada",
+            "messages": [{"role": "user", "content": "write a litellm poem"}],
+            "max_tokens": 10,
         }
         result = response.json()
         print(f"Received response: {result}")