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I need to catch up a bit with this thread, but I wanted to mention I have a huge patch coming that refactors almost all of the scheduler tests into true unit tests.  I'd started this for other reasons and I hope it jives with the plans here.  But if anyone is looking at the scheduler tests, we should sync up.

- Chris

On Nov 30, 2011, at 1:07 PM, Duncan McGreggor <duncan at dreamhost.com> wrote:

> On Tue, Nov 29, 2011 at 12:21 PM, Soren Hansen <soren at linux2go.dk> wrote:
>> It's been a bit over a week since I started this thread. So far we've
>> agreed that running the test suite is too slow, mostly because there
>> are too many things in there that aren't unit tests.
>> 
>> We've also discussed my fake db implementation at length. I think
>> we've generally agreed that it isn't completely insane, so that's
>> moving along nicely.
>> 
>> Duncan has taken the first steps needed to split the test suite into
>> unit tests and everything else:
>> 
>>   https://review.openstack.org/#change,1879
>> 
>> Just one more core +1 needed. Will someone beat me to it? Only time
>> will tell :) Thanks, Duncan!
>> 
>> Anything else around unit testing anyone wants to get into The Great
>> Big Plan[tm]?
> 
> Actually, yeah... one more thing :-)
> 
> Jay and I were chatting about organization of infrastructure last
> night/this morning (on the review comments for the branch I
> submitted). He said that I should raise a concern I expressed for
> wider discussion: right now, tests are all piled into the tests
> directory. Below are my thoughts on this.
> 
> I think such an approach is just fine for smaller projects; there's
> not a lot there, and it's all pretty easy to find. For large projects,
> this seems like not such a good idea for the following reasons:
> 
> * tests are kept separate from the code they relate to
> * there are often odd test module file naming practices required
> (e.g., nova/a/api.py and nova/b/api.py both needing test cases in
> nova/tests/)
> * there's no standard exercised for whether a subpackage gets a
> single test case module or whether it gets a test case subpackage
> * test modules tend to be very long (and thus hard to navigate) due
> to the awkwardness of naming modules when all the code lives together
> * it makes it harder for newcomers to find code; when they live
> together, it's a no-brainer
> 
> OpenStack is definitely not a small project, and as our test coverage
> becomes more complete, these issues will have increased impact. I
> would like to clean all of this up :-) And I'm volunteering to do the
> work! Here's the sort of thing I envision, using nova.volume as an
> example:
> 
> * create nova/volume/tests
> * move all scheduler-related tests (there are several) from
> nova/tests into nova/volume/tests
> * break out tests on a per-module basis (e.g., nova/volume/driver.py
> would get the test module nova/volume/tests/test_driver.py, etc.)
> * for modules that have already been broken out at a more
> fine-grained level, keep (smaller test case modules are nice!)
> * only nova/*.py files will have a test case module in nova/tests
> * bonus: update the test runner to print the full dotted path so it's
> immediately (and visually) clear where one has to go to address any
> failures
> 
> Given approval, this work would be done in its own blueprint. All this
> work would be done in small chunks (probably one branch per module) so
> that it will be easy to review and adjust the approach as needed.
> 
> Thoughts?
> 
> d
> 
>> 
>> --
>> Soren Hansen        | http://linux2go.dk/
>> Ubuntu Developer    | http://www.ubuntu.com/
>> OpenStack Developer | http://www.openstack.org/
>> 
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