I worked around this by making the encodings list a method argument, defaulted 
to the values mentioned. Then I could test by running the method with an 
encoding that I know will fail.

Sent from my iPhone

> On May 29, 2016, at 3:23 AM, Daryle Walker <dary...@mac.com> wrote:
> 
> I'm about to test code that uses this method. My encodings are: ASCII, UTF-8, 
> ISO Latin-1, then MacRoman. I think this covers all potential octet values. 
> My "guard" blocks (I'm using Swift.) are for a 0 return and if the optional 
> returned NSString can't be converted to a String.
> 
> Can I cause some fail cases, or is that so unlikely that I should assert on 
> non-zero return and use "!" on the optional?
> 
> Sent from my iPhone
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