test(gateway): run wallet usage settlement test on larger stack

Wrap the wallet settlement usage test with the large-stack async test helper to
avoid stack overflow in the default test thread.

apps/aether-gateway/src/tests/usage/wallet.rs

@@ -11,8 +11,36 @@ use super::{
 };
 use aether_data::repository::settlement::InMemorySettlementRepository;
 
-#[tokio::test]
-async fn gateway_settles_wallet_for_completed_execution_runtime_sync_usage() {
+fn run_async_test_on_large_stack<F>(name: &'static str, future: F)
+where
+    F: std::future::Future<Output = ()> + Send + 'static,
+{
+    let handle = std::thread::Builder::new()
+        .name(name.to_string())
+        .stack_size(8 * 1024 * 1024)
+        .spawn(move || {
+            tokio::runtime::Builder::new_current_thread()
+                .enable_all()
+                .build()
+                .expect("tokio runtime should build")
+                .block_on(future);
+        })
+        .expect("large-stack test thread should spawn");
+
+    if let Err(payload) = handle.join() {
+        std::panic::resume_unwind(payload);
+    }
+}
+
+#[test]
+fn gateway_settles_wallet_for_completed_execution_runtime_sync_usage() {
+    run_async_test_on_large_stack(
+        "gateway_settles_wallet_for_completed_execution_runtime_sync_usage",
+        gateway_settles_wallet_for_completed_execution_runtime_sync_usage_impl(),
+    );
+}
+
+async fn gateway_settles_wallet_for_completed_execution_runtime_sync_usage_impl() {
     let usage_repository = Arc::new(InMemoryUsageReadRepository::default());
     let request_candidate_repository = Arc::new(InMemoryRequestCandidateRepository::default());
     let billing_repository = Arc::new(InMemoryBillingReadRepository::seed(vec![