diff --git a/X10D.Tests/src/Core/EnumerableTests.cs b/X10D.Tests/src/Core/EnumerableTests.cs
index 97ae244..b320c96 100644
--- a/X10D.Tests/src/Core/EnumerableTests.cs
+++ b/X10D.Tests/src/Core/EnumerableTests.cs
@@ -5,4 +5,11 @@ namespace X10D.Tests.Core;
 [TestClass]
 public partial class EnumerableTests
 {
+    [TestMethod]
+    [DataRow(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)]
+    public void Shuffled(params int[] source)
+    {
+        int[] shuffled = source.Shuffled().ToArray(); // ToArray forces type match
+        CollectionAssert.AreNotEqual(source, shuffled);
+    }
 }