public void AddDescendent()
{
FileSystemDirectory subdir = this.root.OfType <FileSystemDirectory>().First();
FileSystemFile newLeaf = FileSystemFile.Create("added.txt");
FileSystemDirectory updatedRoot = this.root.AddDescendent(newLeaf, subdir);
Assert.Equal(this.root.Identity, updatedRoot.Identity);
FileSystemDirectory updatedSubdir = updatedRoot.OfType <FileSystemDirectory>().First();
Assert.Contains(newLeaf, updatedSubdir);
}
public void AddDescendentWithLookupTableFixup()
{
var root = this.GetRootWithLookupTable();
FileSystemDirectory subdir = root.OfType <FileSystemDirectory>().First();
FileSystemFile newLeaf = FileSystemFile.Create("added.txt");
FileSystemDirectory updatedRoot = root.AddDescendent(newLeaf, subdir);
Assert.Equal(root.Identity, updatedRoot.Identity);
FileSystemDirectory updatedSubdir = updatedRoot.OfType <FileSystemDirectory>().First();
Assert.Contains(newLeaf, updatedSubdir);
}