Capture `Console.Out` and Trace Logs in an XUnit `ITestOutputHelper`

XUnitOutputDemo.cs

public class XUnitOutputDemo : IDisposable
{
    private readonly TextWriter consoleOut;
    private readonly XUnitTestOutputHelperToTextWriterConverter outAdapter;

    public XUnitOutputDemo(ITestOutputHelper output)
    {
        consoleOut = Console.Out;
        converter = new XUnitTestOutputHelperToTextWriterConverter(output);
        Console.SetOut(converter);
        Trace.Listeners.Add(new TextWriterTraceListener(converter));
    }

    public void Dispose()
    {
        Console.SetOut(consoleOut);
        outAdapter.Dispose();
    }

    [Fact]
    public void WriteSomeThings()
    {
        Console.WriteLine("printed");
        Console.Write("also printed");
    }
}

XUnitTestOutputHelperToTextWriterConverter.cs

using System.Text;
using Xunit.Abstractions;

public class XUnitTestOutputHelperToTextWriterConverter : TextWriter
{
    ITestOutputHelper _output;

    public XUnitTestOutputHelperToTextWriterConverter(ITestOutputHelper output)
    {
        _output = output;
    }

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

    public override void WriteLine(string? message)
    {
        _output.WriteLine(message);
    }

    public override void WriteLine(string format, params object?[] args)
    {
        _output.WriteLine(format, args);
    }

    public override void Write(string? value)
    {
        _output.WriteLine(value);
    }

    public override void Write(char value)
    {
        throw new NotSupportedException("This text writer only supports WriteLine(string) and WriteLine(string, params object[]).");
    }
}