diff --git a/src/test/java/one/util/streamex/PermutationSpliteratorTest.java b/src/test/java/one/util/streamex/PermutationSpliteratorTest.java
index <HASH>..<HASH> 100644
--- a/src/test/java/one/util/streamex/PermutationSpliteratorTest.java
+++ b/src/test/java/one/util/streamex/PermutationSpliteratorTest.java
@@ -33,6 +33,8 @@ public class PermutationSpliteratorTest {
     private static List<String> collect(Spliterator<int[]> spliterator) {

         List<String> strings = new ArrayList<>();

         spliterator.forEachRemaining(i -> strings.add(IntStreamEx.of(i).mapToObj(String::valueOf).joining()));

+        spliterator.forEachRemaining(i -> fail("Should not have any more elements"));

+        assertFalse(spliterator.tryAdvance(i -> fail("Should not have any more elements")));

         return strings;

     }
PermutationSpliteratorTest: test used spliterator