Companion libraries

Testably.Abstractions ships two optional NuGet packages that extend IFileSystem with capabilities the BCL keeps in separate namespaces.

Package	Adds to IFileSystem
Testably.Abstractions.Compression	ZipFile() and ZipArchive() extension methods
Testably.Abstractions.AccessControl	GetAccessControl / SetAccessControl on files and directories

Both packages target the IFileSystem interface, so they work transparently against either RealFileSystem or MockFileSystem.