From fa4aec2b26696cc16dc44c6425f7dca3ef91c8ee Mon Sep 17 00:00:00 2001
From: MarcoFalke <falke.marco@gmail.com>
Date: Mon, 26 Apr 2021 08:22:47 +0200
Subject: [PATCH] test: Fix feature_notifications.py intermittent issue

---
 test/functional/feature_notifications.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/test/functional/feature_notifications.py b/test/functional/feature_notifications.py
index 4e2de1daf42..6fc8773ee3c 100755
--- a/test/functional/feature_notifications.py
+++ b/test/functional/feature_notifications.py
@@ -166,6 +166,8 @@ class NotificationsTest(BitcoinTestFramework):
         # Should now verify contents of each file
         for tx_id, blockheight, blockhash in tx_details:
             fname = os.path.join(self.walletnotify_dir, notify_outputname(self.wallet, tx_id))
+            # Wait for the cached writes to hit storage
+            self.wait_until(lambda: os.path.getsize(fname) > 0, timeout=10)
             with open(fname, 'rt', encoding='utf-8') as f:
                 text = f.read()
                 # Universal newline ensures '\n' on 'nt'