Code for redirecting standard streams, for use in unit tests

RedirectStandardStreams.cs

/// This class redirects Console.Out so that it can be tested against. Usage:
///
/// <code>
/// using var output = new ConsoleOutput();
/// // Something that prints stuff...
/// output.GetOutput(); // Returns what was printed
/// </code>
///
/// Source: https://stackoverflow.com/a/13397075
public class ConsoleOutput : IDisposable
{
    private readonly StringWriter _stringWriter;
    private readonly TextWriter _originalOutput;

    public ConsoleOutput()
    {
        _stringWriter = new StringWriter();
        _originalOutput = Console.Out;
        Console.SetOut(_stringWriter);
    }

    public string GetOutput()
    {
        return _stringWriter.ToString();
    }

    public void Dispose()
    {
        Console.SetOut(_originalOutput);
        _stringWriter.Dispose();
    }
}

/// This class redirects Console.Error so that it can be tested against. Usage:
///
/// <code>
/// using var output = new ConsoleError();
/// // Something that prints stuff...
/// output.GetError(); // Returns what was printed
/// </code>
///
/// Inspired by: https://stackoverflow.com/a/13397075
public class ConsoleError : IDisposable
{
    private readonly StringWriter _stringWriter;
    private readonly TextWriter _originalOutput;

    public ConsoleError()
    {
        _stringWriter = new StringWriter();
        _originalOutput = Console.Error;
        Console.SetError(_stringWriter);
    }

    public string GetError()
    {
        return _stringWriter.ToString();
    }

    public void Dispose()
    {
        Console.SetError(_originalOutput);
        _stringWriter.Dispose();
    }
}

/// This class hijacks Console.In so that it can be tested against. Usage:
///
/// <code>
/// using var input = new ConsoleInput("This is my stdin" + Environment.NewLine);
/// // Something that takes stuff from stdin...
/// </code>
///
/// Inspired by: https://stackoverflow.com/a/13397075
///
public class ConsoleInput : IDisposable
{
    private readonly StringReader _stringReader;
    private readonly TextReader _originalInput;

    public ConsoleInput(string input)
    {
        _stringReader = new StringReader(input);
        _originalInput = Console.In;
        Console.SetIn(_stringReader);
    }

    public void Dispose()
    {
        Console.SetIn(_originalInput);
        _stringReader.Dispose();
    }
}