Name: TestableIO.System.IO.Abstractions.Extensions
Author: Tatham Oddie - Luigi Grilli & friends

TestableIO.System.IO.Abstractions.Extensions v22.0.2 — nugetz

var current = new FileSystem().CurrentDirectory();

//create a "test.txt" file with extension
using (var stream = current.File("test.txt").Create())
    stream.Dispose();

//create a "test.txt" file without extension
using (var stream = current.FileSystem.FileInfo.FromFileName(current.FileSystem.Path.Combine(current.FullName, "test.txt")).Create())
    stream.Dispose();

var fs = new FileSystem();

//with extension
using (fs.CreateDisposableDirectory(out IDirectoryInfo dir))
{
    Console.WriteLine($"This directory will be deleted when control leaves the using block: '{dir.FullName}'");
}

//without extension
var temp = fs.Path.GetTempPath();
var fileName = fs.Path.GetRandomFileName();
var path = fs.Path.Combine(temp, fileName);

try
{
    IDirectoryInfo dir = fs.Directory.CreateDirectory(path);
    Console.WriteLine($"This directory will be deleted in the finally block: '{dir.FullName}'");
}
finally
{
    fs.Directory.Delete(path, recursive: true);
}

var fs = new FileSystem();
var current = fs.CurrentDirectory();

//source
var source =  current.SubDirectory("source");
source.Create(); //make sure the source directory exists

//destination
var dest = current.SubDirectory("destination");

//copy
source.CopyTo(dest, recursive: true);

TestableIO/TestableIO.System.IO.Abstractions.Extensionsv22.0.2

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Readme

Examples

CurrentDirectory extension

SubDirectory extension

File extension

Automatic cleanup with Disposable extensions

IDirectoryInfo.CopyTo extension