[Twisted-Python] Another brown paper bug release.

Glyph Lefkowitz glyph at twistedmatrix.com
Wed May 9 04:16:09 EDT 2001

On Wednesday 09 May 2001 00:19, you wrote:

> Random note: web.Resource and friends and web.Request do not rely on an
> internet connection: they rely on a handler which has a .server with some
> properties and some other attributes. Creating such a handler is no problem
> if we start from FileWrapper, add attributes, and create a server and
> attach it to the handler ourselves.
> So any *recorded and analysed* bug should be able to quickly become a test
> case.

While this is true in theory, there are many practical concerns that can't be 
simulated by an automatic test case; the one outstanding bug is one of these. 
 Since twisted.web relies on external processes -- for server distribution, 
for CGI scripts -- race conditions may arise that are impossible to unit 
test.  So, we need some functional testing as well, to make sure that those 
sorts of conditions don't arise.

If anyone else can think of a way to get fork() into a unit test, I'd like to 
hear about it :).  But, even more than that, I am frequently surprised when I 
try to run "working" code on Windows or Jython and have it crash due to some 
undocumented incompatibility (or even a documented one that I just haven't 
read about).

I'm a big proponent of automated testing, though, so I'd love to be wrong.

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