Hi @adamwoolhether , thanks for posting.
The test as shown in the book is actually correct because the method Load shouldn’t return an error when the file doesn’t exist. Please check the method definition a few pages before.
You can also check it by writing the test as you suggested and verifying that it fails.
The idea behind this logic is allowing the user to specify a file name in the configuration and, if it doesn’t exist, the application creates it when saving the first host.
Hope this helps.
Ricardo