From 9cb0151544c671f2483d467a4589fdb65c467fd0 Mon Sep 17 00:00:00 2001
From: Brennan Watt <brennan.watt@solana.com>
Date: Fri, 2 Dec 2022 08:47:09 -0800
Subject: [PATCH] RPC unit test timeout fix (#28998)

---
 rpc/src/rpc_subscriptions.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/rpc/src/rpc_subscriptions.rs b/rpc/src/rpc_subscriptions.rs
index e43f3c00b56e84..47a8c597ba9584 100644
--- a/rpc/src/rpc_subscriptions.rs
+++ b/rpc/src/rpc_subscriptions.rs
@@ -1411,6 +1411,12 @@ pub(crate) mod tests {
                     encoding: UiAccountEncoding::Binary,
                 }));
 
+            // Sleep here to ensure adequate time for the async thread to fully process the
+            // subscribed notification before the bank transaction is processed. Without this
+            // sleep, the bank transaction ocassionally completes first and we hang forever
+            // waiting to receive a bank notification.
+            std::thread::sleep(Duration::from_millis(100));
+
             bank_forks
                 .read()
                 .unwrap()