Dealing with files in PSUnit

Question

I'm writing a Powershell script which is going to go out into a client's current source control system and do a mass rename on all of the files so that they follow a new naming convention.

Being the diligent TDD developer that I am, I started with putting together a PSUnit test case. At first I was thinking that I would pass in a string to my function for the file name (along with a couple of other relevant parameters) and then return a string. Then it occurred to me that I am going to need to break apart the file name into an extension and a base name. Since System.IO.FileInfo already has that functionality, I thought why not just pass in a file object instead of a string?

If I do that however, then I don't see how I can write my PSUnit test without it being reliant on an external resource (in this case, the file must exist for me to get the FileInfo object - or does it?).

Is there a "clean" way to handle this? How are others approaching these issues?

Thanks for any help or advice!

Answer 1

My suggestion is: Be pragmatic and pass in the base name and extension as two separate strings. For convenience reasons, you can provide an overload that accepts a FileInfo.