[TIP] RFF: Article on python test design pattern - DAI

Barry Warsaw barry at python.org
Tue Dec 8 07:28:01 PST 2009

On Dec 8, 2009, at 10:13 AM, Olemis Lang wrote:

> Hmmmm ... if something failed in your (unit)tests then it should be an
> exception condition (considering unittest philosophy and | or style
> since you write «positive» test cases i.e. conditions that have be
> asserted in to make the TC pass) . Isn't it ?

Something you might consider for more modern Pythons is to create a test exception hierarchy derived from BaseException instead of Exception.  Then common idioms like:

except Exception:

won't catch the test assertion.  A bare except will, but those are (mostly) evil right? :)

Unfortunately AssertionError won't cut it for this since it has Exception in its parentage.


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