Clark C. Evans wrote:
On Tue, Jan 11, 2005 at 12:54:36PM -0500, Phillip J. Eby wrote:
...
| * In my experience, incorrectly deriving an interface from another is the
| most common source of unintended adaptation side-effects, not adapter
| composition
It'd be nice if interfaces had a way to specify a test-suite that
could be run against a component which claims to be compliant. For
example, it could provide invalid inputs and assert that the proper
errors are returned, etc.
We've tried this in Zope 3 with very limited success. In fact,
so far, our attempts have provided more pain than their worth.
The problem is that interfaces are usually abstract enough that
it's very difficult to write generic tests. For example,
many objects implement mapping protocols, but place restrictions
on the values stored. It's hard to provide generic tests that don't
require lots of inconvenient hooks. There are exceptions of course.
Our ZODB storage tests use a generic storage-interface test, but this
is possible because the ZODB storage interfaces are extremely
concrete.
Jim
--
Jim Fulton mailto:[EMAIL PROTECTED] Python Powered!
CTO (540) 361-1714 http://www.python.org
Zope Corporation http://www.zope.com http://www.zope.org
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