tathamoddie/System.IO.Abstractions — pull request #41 by aklg (2013-04-24 18:25:28+00:00)
Title: Fixed MockFile.Exists(null), MockFile.Create(existingFile) and MockFile.Create(readOnlyFile)

* MockFile.Exists(null) now returns false instead of throwing.
* MockFile.Create(existingFile) now overwrites existing file instead of throwing.
* Fixed in MockFileSystem.AddFile()
* MockFile.Create(readOnlyFile) now throws UnauthorizedAccessException.
* Implemented MockFile.SetAttributes().