diff --git a/UnitTests/UnitTests.HighPerformance.Shared/Extensions/Test_ArrayExtensions.2D.cs b/UnitTests/UnitTests.HighPerformance.Shared/Extensions/Test_ArrayExtensions.2D.cs
index 8215eba7a12..66aab7c3fb6 100644
--- a/UnitTests/UnitTests.HighPerformance.Shared/Extensions/Test_ArrayExtensions.2D.cs
+++ b/UnitTests/UnitTests.HighPerformance.Shared/Extensions/Test_ArrayExtensions.2D.cs
@@ -194,6 +194,7 @@ public void Test_ArrayExtensions_2D_GetRow_Rectangle()
             Assert.AreSame(new int[1, 0].GetRow(0).ToArray(), Array.Empty<int>());
 
             Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.GetRow(-1));
+            Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.GetRow(3));
 
             Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.GetRow(20));
         }
@@ -221,6 +222,7 @@ public void Test_ArrayExtensions_2D_GetColumn_Rectangle()
             CollectionAssert.AreEqual(array.GetColumn(1).ToArray(), new[] { 2, 6, 10 });
 
             Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.GetColumn(-1));
+            Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.GetColumn(4));
 
             Assert.ThrowsException<ArgumentOutOfRangeException>(() => array.GetColumn(20));
         }