From 36597bd27148c82ab69f5fddd58a7af5e3961c93 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Franz=20P=C3=B6schel?= <franz.poeschel@gmail.com>
Date: Mon, 3 Jun 2024 17:47:32 +0200
Subject: [PATCH] write_test_zero_extent: require flush to buffer

Somehow PerformDataWrite() leads to trouble with this pattern.
---
 test/ParallelIOTest.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/test/ParallelIOTest.cpp b/test/ParallelIOTest.cpp
index 7087afec57..b273c7a342 100644
--- a/test/ParallelIOTest.cpp
+++ b/test/ParallelIOTest.cpp
@@ -132,7 +132,8 @@ void write_test_zero_extent(
     Series o = Series(
         filePath.append(".").append(file_ending),
         Access::CREATE,
-        MPI_COMM_WORLD);
+        MPI_COMM_WORLD,
+        "adios2.engine.preferred_flush_target = \"buffer\"");
 
     int const max_step = 100;