From 70dc0a69a4bbd9d1c7e23c72d516dba28ab39d6c Mon Sep 17 00:00:00 2001
From: mateo-berri <277851410+mateo-berri@users.noreply.github.com>
Date: Wed, 2 Sep 2026 22:16:41 -0700
Subject: [PATCH] test(ai-gateway): cover the blank session id and model
 fallbacks

The emptiness guards in on_session had no test, so the let-chain rewrite
could have dropped them unnoticed.
---
 .../ai-gateway/src/realtime/streaming.rs      | 26 +++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/litellm-rust/crates/ai-gateway/src/realtime/streaming.rs b/litellm-rust/crates/ai-gateway/src/realtime/streaming.rs
index edd9338b4f2..c0d72e90b77 100644
--- a/litellm-rust/crates/ai-gateway/src/realtime/streaming.rs
+++ b/litellm-rust/crates/ai-gateway/src/realtime/streaming.rs
@@ -323,6 +323,32 @@ mod tests {
         assert_eq!(streaming.dropped(), 0);
     }
 
+    #[test]
+    fn blank_session_id_and_model_keep_the_gateway_fallbacks() {
+        let mut streaming = RealTimeStreaming::new(
+            Vec::new(),
+            "call_fallback".to_string(),
+            "gpt-realtime".to_string(),
+            RequestMetadata::default(),
+        );
+
+        streaming.observe(&event(
+            r#"{"type":"session.created","session":{"id":"","model":""}}"#,
+        ));
+        let payload = streaming.build_payload();
+        assert_eq!(payload.id, "call_fallback");
+        assert_eq!(payload.litellm_call_id, "call_fallback");
+        assert_eq!(payload.model, "gpt-realtime");
+
+        streaming.observe(&event(
+            r#"{"type":"session.updated","session":{"id":"sess_002","model":""}}"#,
+        ));
+        let payload = streaming.build_payload();
+        assert_eq!(payload.id, "sess_002");
+        assert_eq!(payload.litellm_call_id, "sess_002");
+        assert_eq!(payload.model, "gpt-realtime");
+    }
+
     #[test]
     fn payload_serializes_with_camelcase_times_and_realtime_call_type() {
         let mut streaming = RealTimeStreaming::new(