fix: harden bulk wallet balance adjustment

apps/aether-gateway/src/state/app.rs

@@ -492,6 +492,8 @@ pub struct AppState {
         Arc<StdMutex<HashMap<String, aether_data::repository::wallet::StoredWalletSnapshot>>>,
     >,
     #[cfg(test)]
+    pub(crate) auth_wallet_adjustment_error_for_tests: Option<String>,
+    #[cfg(test)]
     pub(crate) admin_wallet_payment_order_store:
         Option<Arc<StdMutex<HashMap<String, AdminWalletPaymentOrderRecord>>>>,
     #[cfg(test)]

apps/aether-gateway/src/state/core.rs

@@ -466,6 +466,8 @@ impl AppState {
             #[cfg(test)]
             auth_wallet_store: Some(Arc::new(StdMutex::new(HashMap::new()))),
             #[cfg(test)]
+            auth_wallet_adjustment_error_for_tests: None,
+            #[cfg(test)]
             admin_wallet_payment_order_store: Some(Arc::new(StdMutex::new(HashMap::new()))),
             #[cfg(test)]
             admin_payment_callback_store: Some(Arc::new(StdMutex::new(HashMap::new()))),

apps/aether-gateway/src/state/runtime/wallet/balance_mutations.rs

@@ -18,6 +18,13 @@ impl AppState {
         )>,
         GatewayError,
     > {
+        #[cfg(test)]
+        if self.auth_wallet_adjustment_error_for_tests.as_deref() == Some(wallet_id) {
+            return Err(GatewayError::Internal(
+                "injected test wallet adjustment failure".to_string(),
+            ));
+        }
+
         #[cfg(test)]
         if let Some(store) = self.auth_wallet_store.as_ref() {
             let mut guard = store.lock().expect("auth wallet store should lock");

apps/aether-gateway/src/state/testing.rs

@@ -472,6 +472,14 @@ impl AppState {
         self
     }
 
+    pub(crate) fn fail_auth_wallet_adjustment_for_tests(
+        mut self,
+        wallet_id: impl Into<String>,
+    ) -> Self {
+        self.auth_wallet_adjustment_error_for_tests = Some(wallet_id.into());
+        self
+    }
+
     pub(crate) fn with_admin_wallet_payment_orders_for_tests<I>(mut self, orders: I) -> Self
     where
         I: IntoIterator<Item = crate::AdminWalletPaymentOrderRecord>,