Testing edge cases and undocumented behavior
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?
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