public void Directory_Delete()
{
var tmpSrc = GetNewFileNameOnTempPath("");
Directory.CreateDirectory(tmpSrc);
const string fileName = @"temp.txt";
FileSystem.WriteText(FileSystem.CombinePath(tmpSrc, fileName), "test");
Assert.Throws <IOException>(() => FileSystem.DeleteDirectory(tmpSrc));
FileSystem.DeleteDirectory(tmpSrc, recursive: true);
Assert.IsFalse(FileSystem.DirectoryExists(tmpSrc));
var tmpSrc2 = GetNewFileNameOnTempPath("");
Directory.CreateDirectory(tmpSrc2);
FileSystem.DeleteDirectory(tmpSrc2);
Assert.IsFalse(FileSystem.DirectoryExists(tmpSrc2));
}