From 4c1a94ea7454c2a8105b210f2915e5eee6b67a4f Mon Sep 17 00:00:00 2001
From: Javier Godoy <11554739+javier-godoy@users.noreply.github.com>
Date: Thu, 21 May 2026 08:36:06 -0300
Subject: [PATCH] test: spin until the thread reaches barrier.await

Close #197
---
 .../addons/gridexporter/test/ConcurrentExportTests.java   | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/test/java/com/flowingcode/vaadin/addons/gridexporter/test/ConcurrentExportTests.java b/src/test/java/com/flowingcode/vaadin/addons/gridexporter/test/ConcurrentExportTests.java
index 7d67b86..1d8fbaf 100644
--- a/src/test/java/com/flowingcode/vaadin/addons/gridexporter/test/ConcurrentExportTests.java
+++ b/src/test/java/com/flowingcode/vaadin/addons/gridexporter/test/ConcurrentExportTests.java
@@ -279,6 +279,14 @@ public MockDownload await() throws InterruptedException {
           thread.start();
         }
         latch.await();
+        // Spin until the thread reaches barrier.await() (WAITING state).
+        // latch.countDown() happens before barrier.await(), so there is a window
+        // where latch==0 but the thread hasn't entered the barrier yet.
+        // Assumes the barrier has not fired yet; otherwise WAITING could mean
+        // exchanger.exchange() rather than barrier.await().
+        while (thread.isAlive() && thread.getState() != Thread.State.WAITING) {
+          Thread.onSpinWait();
+        }
         return this;
       }