Testing edge cases and undocumented behavior

Scott Ritchie scott at open-vote.org
Fri Aug 26 07:42:27 CDT 2011

On 08/26/2011 12:52 AM, Francois Gouget wrote:
> On Thu, 25 Aug 2011, Vincent Povirk wrote:
> [...]
>> * Is a Windows application likely to need this?
> I'd add a couple of factors that pertain to this:
>  * Is the behavior documented by the MSDN? If yes then applications are 
>    more likely to rely on it.
>  * Does the behavior correspond to a known usage pattern? If yes, then 
>    even if not documented in the MSDN, applications are likely to depend 
>    on it. Two examples:
>    - APIs that take an 'LPSTR output_buffer, DWORD *buffer_size' pair of
>      parameters. If they allow the programmer to pass 'NULL, &size' 
>      where size=0 as parameters to determine the required buffer size, 
>      then you can expect applications to make use of it even if the MSDN 
>      forgot to document it.
>    - APIs that take output parameters and will simply not fill them if 
>      the pointer is NULL instead of crashing.

Incidentally, this is basically what the series of tests I wrote that
prompted this discussion check.  They're currently at "pending" in patch


> Of course the first thing to test is that these are are actually 
> supported across a broad swath of the more recent Windows versions.

Do you think testbot handles that nicely?

Scott Ritchie

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