Best practices for testing functions that opens files

[abanstadya via Digitalmars-d-learn]

On Tuesday, 5 August 2014 at 23:22:24 UTC, splatterdash wrote:
> Hi all,
>
> Is there a recommended way to test functions that opens and 
> iterates over files? The unittest block seems more suited for 
> testing functions whose input and output can be defined in the 
> program itself. I'm wondering if there is a better way to test 
> functions that open files with specific formats.
>
> Thanks before :).

The concern would be more on functions that delete files. 
Yesterday I've made a programming error which resulted into the 
deletion if the source files of another project. Fortunately the 
other project was git-i-fyed and I just had to stash/pull to 
recover my files.
Take care. Opening files with wrong args can overwrite, delete 
the curent one.
Maybe make a sandbox environment (clean brand new account).