Hi all,
We did a spike last week to de-couple our view and controller tests
from the database, using NullDb. It didn't go too well. I realise that
this plugin isn't part of RSpec, but I thought others on this list
might have experiences to share.
Here's a summary of my colleague's investigations:
I installed the plugin from http://github.com/jakehow/nulldb/tree/master
Changed spec/spec_helper to set
"ActiveRecord::Base.establish_connection(:adapter => :nulldb)" by
default.
The specs that complained of the lack of db, I included a before(all)
that changed the connection to the test database (include
NeedsDatabase - copied from Ben Mabey's Functional module)
By default, I also included the db for all models (config.include
NeedsDatabase, :type => :model)
Running spec spec/views with or without nulldb takes about the same
time (a couple of seconds less with nulldb). However, running "rake
spec" with nulldb takes 10 times longer!!
Another weird thing was that three tests failed in the controllers
(venues and concerts) in a very strange way, even when I included the
NeedsDatabase in the tests that needed it. The weird bit is, when I
run: "spec spec/controllers/venues_controller_spec.rb" it doesn't
fail. But when I run: "spec spec/controllers/users_controller_spec.rb
spec/controllers/venues_controller_spec.rb" It does fail... That is,
the user_controller test is influencing the results of the
venue_controller test!
The same weird behaviour happens in lib/sk/find
This made me had to include NeedsDatabase for all lib and controllers
tests as well.
The barrier for us was the shockingly poor performance of 'rake spec'
on the view specs - it really means we just can't use it, and actually
only barely improved the performance of the specs at all.
I was disappointed that the view specs didn't get any faster. My guess
is that stub_model is the problem - as it has to do quite a bit of
work to set up the attributes on the models.
So, can anyone tell us what we might have been doing wrong? Or did I
just have unrealistic expectations of how this might help?
Matt Wynne
http://blog.mattwynne.net
http://www.songkick.com
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