Imported Upstream version 5.0.0.42

Former-commit-id: fd56571888259555122d8a0f58c68838229cea2b

external/corefx/src/System.Threading.Timer/tests/TimerChangeTests.netstandard.cs

@@ -0,0 +1,28 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Threading;
+using Xunit;
+
+public partial class TimerChangeTests
+{
+    [Fact]
+    public void Timer_Change_Int64_Negative()
+    {
+        Assert.Throws<ArgumentOutOfRangeException>(() => new Timer(EmptyTimerTarget).Change((long)-2, (long)-1));
+        Assert.Throws<ArgumentOutOfRangeException>(() => new Timer(EmptyTimerTarget).Change((long)-1, (long)-2));
+        Assert.Throws<ArgumentOutOfRangeException>(() => new Timer(EmptyTimerTarget).Change((long)0xffffffff, (long)-1));
+        Assert.Throws<ArgumentOutOfRangeException>(() => new Timer(EmptyTimerTarget).Change((long)-1, (long)0xffffffff));
+    }
+
+    [Fact]
+    public void Timer_Change_UInt32_Int64_AfterDispose_Throws()
+    {
+        var t = new Timer(EmptyTimerTarget);
+        t.Dispose();
+        Assert.Throws<ObjectDisposedException>(() => t.Change(0u, 0u));
+        Assert.Throws<ObjectDisposedException>(() => t.Change(0L, 0L));
+    }
+}