From 32347d136cfbf8c6215c33c96ab4a005b2eb4afc Mon Sep 17 00:00:00 2001
From: Michiel Meeuwissen <michiel.meeuwissen@gmail.com>
Date: Sat, 19 Oct 2024 18:37:38 +0200
Subject: [PATCH] thread safety.

---
 .../org/meeuw/test/math/streams/CartesianSpliteratorTest.java  | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mihxil-math/src/test/java/org/meeuw/test/math/streams/CartesianSpliteratorTest.java b/mihxil-math/src/test/java/org/meeuw/test/math/streams/CartesianSpliteratorTest.java
index fc9bb11a..01c76147 100644
--- a/mihxil-math/src/test/java/org/meeuw/test/math/streams/CartesianSpliteratorTest.java
+++ b/mihxil-math/src/test/java/org/meeuw/test/math/streams/CartesianSpliteratorTest.java
@@ -19,6 +19,7 @@
 
 import java.io.*;
 import java.util.*;
+import java.util.concurrent.CopyOnWriteArrayList;
 import java.util.concurrent.atomic.AtomicLong;
 import java.util.function.Consumer;
 import java.util.function.Supplier;
@@ -245,7 +246,7 @@ public void infiniteStreamSplit(int dim) {
             () -> Stream.iterate(1, i -> i + 2).spliterator();
         CartesianSpliterator<Integer> cartesianSpliterator =
             new CartesianSpliterator<>(iterate, dim);
-        final List<Integer[]> result = new ArrayList<>();
+        final List<Integer[]> result = new CopyOnWriteArrayList<>();
         assertThat(cartesianSpliterator.estimateSize()).isEqualTo(Long.MAX_VALUE);
         StreamSupport.stream(cartesianSpliterator, true).limit(100).forEach(a -> {
             log.info("{} ({})", Arrays.asList(a), Thread.currentThread().getName());