diff --git a/apps/aether-gateway/src/data/state/testing/mod.rs b/apps/aether-gateway/src/data/state/testing/mod.rs
index 230c77a3d..0babed923 100644
--- a/apps/aether-gateway/src/data/state/testing/mod.rs
+++ b/apps/aether-gateway/src/data/state/testing/mod.rs
@@ -1,10 +1,15 @@
 use std::collections::BTreeMap;
 use std::sync::{Arc, RwLock};
 
+use aether_data::repository::routing_profiles::InMemoryRoutingGroupRepository;
 use aether_data_contracts::repository::candidates::RequestCandidateRepository;
 use aether_data_contracts::repository::pool_scores::PoolMemberScoreRepository;
 use aether_data_contracts::repository::quota::ProviderQuotaRepository;
+use aether_data_contracts::repository::routing_profiles::{
+    StoredRoutingGroup, StoredRoutingGroupBinding, StoredRoutingGroupVersion,
+};
 use aether_data_contracts::repository::usage::UsageRepository;
+use aether_routing_core::RoutingGroupConfig;
 
 use super::{
     AnnouncementReadRepository, AnnouncementWriteRepository, AuthApiKeyReadRepository,
@@ -892,6 +897,30 @@ impl GatewayDataState {
         self
     }
 
+    #[cfg(test)]
+    pub(crate) fn with_system_default_routing_group_for_tests(self) -> Self {
+        let now = 1;
+        let repository = Arc::new(InMemoryRoutingGroupRepository::seed(
+            [StoredRoutingGroup {
+                id: "system-default".to_string(),
+                name: "system-default".to_string(),
+                description: Some("test system default routing strategy".to_string()),
+                enabled: true,
+                is_system_default: true,
+                sort_order: 0,
+                config_json: serde_json::to_value(RoutingGroupConfig::default())
+                    .expect("default routing config should serialize"),
+                version: 1,
+                created_at: now,
+                updated_at: now,
+                published_at: Some(now),
+            }],
+            std::iter::empty::<StoredRoutingGroupBinding>(),
+            std::iter::empty::<StoredRoutingGroupVersion>(),
+        ));
+        self.with_routing_group_repository_for_tests(repository)
+    }
+
     #[cfg(test)]
     pub(crate) fn with_auth_api_key_reader(
         mut self,
diff --git a/apps/aether-gateway/src/tests/ai_execute/finalize_local.rs b/apps/aether-gateway/src/tests/ai_execute/finalize_local.rs
index 2a699a237..3bac90c5d 100644
--- a/apps/aether-gateway/src/tests/ai_execute/finalize_local.rs
+++ b/apps/aether-gateway/src/tests/ai_execute/finalize_local.rs
@@ -1877,7 +1877,8 @@ async fn gateway_executes_openai_chat_antigravity_cross_format_sync_via_local_fi
                     Arc::clone(&request_candidate_repository),
                     Arc::clone(&usage_repository),
                     DEVELOPMENT_ENCRYPTION_KEY,
-                ),
+                )
+                .with_system_default_routing_group_for_tests(),
             );
     let gateway = build_router_with_state(gateway_state);
     let (gateway_url, gateway_handle) = start_server(gateway).await;
diff --git a/apps/aether-gateway/src/tests/ai_execute/finalize_local_cli/cross_format.rs b/apps/aether-gateway/src/tests/ai_execute/finalize_local_cli/cross_format.rs
index d5d79c9a2..613dc13d0 100644
--- a/apps/aether-gateway/src/tests/ai_execute/finalize_local_cli/cross_format.rs
+++ b/apps/aether-gateway/src/tests/ai_execute/finalize_local_cli/cross_format.rs
@@ -1425,7 +1425,8 @@ async fn gateway_executes_openai_responses_antigravity_cross_format_upstream_str
                     Arc::clone(&request_candidate_repository),
                     Arc::clone(&usage_repository),
                     DEVELOPMENT_ENCRYPTION_KEY,
-                ),
+                )
+                .with_system_default_routing_group_for_tests(),
             )
             .with_oauth_refresh_coordinator_for_tests(oauth_refresh);
     let gateway = build_router_with_state(gateway_state);
diff --git a/apps/aether-gateway/src/tests/ai_execute/finalize_local_provider/gemini.rs b/apps/aether-gateway/src/tests/ai_execute/finalize_local_provider/gemini.rs
index 509186eab..25da1ed30 100644
--- a/apps/aether-gateway/src/tests/ai_execute/finalize_local_provider/gemini.rs
+++ b/apps/aether-gateway/src/tests/ai_execute/finalize_local_provider/gemini.rs
@@ -2004,7 +2004,8 @@ async fn gateway_executes_antigravity_gemini_cli_sync_upstream_stream_via_local_
                     Arc::clone(&request_candidate_repository),
                     Arc::clone(&usage_repository),
                     DEVELOPMENT_ENCRYPTION_KEY,
-                ),
+                )
+                .with_system_default_routing_group_for_tests(),
             )
             .with_oauth_refresh_coordinator_for_tests(oauth_refresh);
     let gateway = build_router_with_state(gateway_state);
diff --git a/apps/aether-gateway/src/tests/ai_execute/stream_provider_gemini/local_cli.rs b/apps/aether-gateway/src/tests/ai_execute/stream_provider_gemini/local_cli.rs
index 5de65b509..5e2e11b21 100644
--- a/apps/aether-gateway/src/tests/ai_execute/stream_provider_gemini/local_cli.rs
+++ b/apps/aether-gateway/src/tests/ai_execute/stream_provider_gemini/local_cli.rs
@@ -1915,6 +1915,7 @@ async fn gateway_executes_antigravity_gemini_cli_stream_via_local_decision_gate_
             Arc::clone(&request_candidate_repository),
             DEVELOPMENT_ENCRYPTION_KEY,
         )
+        .with_system_default_routing_group_for_tests()
         .with_system_config_values_for_tests([(
             crate::constants::ANTIGRAVITY_BEARER_BRIDGE_CONFIG_KEY.to_string(),
             json!({
diff --git a/apps/aether-gateway/src/tests/ai_execute/sync/gemini/cli.rs b/apps/aether-gateway/src/tests/ai_execute/sync/gemini/cli.rs
index 6beb48a01..707a995d1 100644
--- a/apps/aether-gateway/src/tests/ai_execute/sync/gemini/cli.rs
+++ b/apps/aether-gateway/src/tests/ai_execute/sync/gemini/cli.rs
@@ -2234,7 +2234,8 @@ async fn gateway_executes_antigravity_gemini_cli_sync_via_local_decision_gate_af
             provider_catalog_repository,
             Arc::clone(&request_candidate_repository),
             DEVELOPMENT_ENCRYPTION_KEY,
-        ),
+        )
+        .with_system_default_routing_group_for_tests(),
     )
     .with_oauth_refresh_coordinator_for_tests(oauth_refresh);
     let gateway = build_router_with_state(gateway_state);