Add {ReadOnly}Memory.Span tests when memory contains invalid values (#28896)

* Add {ReadOnly}Memory.Span tests when memory contains invalid values

* Address PR feedback

1 files changed, 23 insertions, 0 deletions

diff --git a/src/System.Memory/tests/Memory/Span.cs b/src/System.Memory/tests/Memory/Span.cs
index 472310d786..55ed001b3d 100644
--- a/src/System.Memory/tests/Memory/Span.cs
+++ b/src/System.Memory/tests/Memory/Span.cs
@@ -106,5 +106,28 @@ namespace System.MemoryTests
             Assert.True(spanObject.SequenceEqual(default));
         }
 
+        [Fact]
+        public static void TornMemory_Array_SpanThrowsIfOutOfBounds()
+        {
+            Memory<int> memory;
+
+            memory = TestHelpers.DangerousCreateMemory<int>(new int[4], 0, 5);
+            Assert.Throws<ArgumentOutOfRangeException>(() => memory.Span.DontBox());
+
+            memory = TestHelpers.DangerousCreateMemory<int>(new int[4], 3, 2);
+            Assert.Throws<ArgumentOutOfRangeException>(() => memory.Span.DontBox());
+        }
+
+        [Fact]
+        public static void TornMemory_String_SpanThrowsIfOutOfBounds()
+        {
+            Memory<char> memory;
+
+            memory = TestHelpers.DangerousCreateMemory<char>("1234", 0, 5);
+            Assert.Throws<ArgumentOutOfRangeException>(() => memory.Span.DontBox());
+
+            memory = TestHelpers.DangerousCreateMemory<char>("1234", 3, 2);
+            Assert.Throws<ArgumentOutOfRangeException>(() => memory.Span.DontBox());
+        }
     }
 }