Add a Stack.TrimExcess test

dotnet · Feb 23, 2023 · 678e131 · 678e131
1 parent 456496a
commit 678e131
Showing 1 changed file with 11 additions and 0 deletions.
diff --git a/src/libraries/System.Collections/tests/Generic/Stack/Stack.Generic.Tests.cs b/src/libraries/System.Collections/tests/Generic/Stack/Stack.Generic.Tests.cs
@@ -239,6 +239,17 @@ public void Stack_Generic_TrimExcess_AfterClearingAndAddingAllElementsBack(int c
             }
         }
 
+        [Fact]
+        public void Stack_Generic_TrimExcess_DoesNotInvalidateEnumeration()
+        {
+            Stack<T> stack = GenericStackFactory(10);
+            stack.EnsureCapacity(100);
+
+            IEnumerator<T> enumerator = stack.GetEnumerator();
+            stack.TrimExcess();
+            enumerator.MoveNext();
+        }
+
         #endregion
 
         [Theory]