// Copyright (c) Microsoft. All rights reserved.

// Licensed under the MIT license. See LICENSE file in the project root for full license information.

using System;

using System.IO;

using System.Text;

using System.Threading;

using Xunit;

public class SyncTextWriter

{

[Fact]

public void SyncTextWriterLockedOnThis()

{

TextWriter oldWriter = Console.Out;

try

{

var newWriter = new CallbackTextWriter();

Console.SetOut(newWriter);

TextWriter syncWriter = Console.Out;

bool called = false;

newWriter.Callback = _ =>

{

Assert.True(Monitor.IsEntered(syncWriter));

called = true;

};

Console.Write("c");

Assert.True(called);

}

finally

{

Console.SetOut(oldWriter);

}

}

private sealed class CallbackTextWriter : TextWriter

{

internal Action<char> Callback;

public override Encoding Encoding { get { return Encoding.UTF8; } }

public override void Write(char value) { Callback(value); }

}

}