Rails - May 2009 - Unit testing an Observer

Hi,

How can I unit test an Observer? Its new method is private, and I can''t
find any documentation on that topic.
-- 
Posted via http://www.ruby-forum.com/.

Fernando Perez wrote:
> How can I unit test an Observer? Its new method is private, and I
can''t
> find any documentation on that topic.
Can''t you trigger the observed event - such as Frob.create - and then
detect the
side-effect the observer produces?

-- 
   Phlip
   http://flea.sourceforge.net/resume.html

Here''s part of a spec (with some details changed/omitted) for an
observer
that notifies another system via a SOAP API that a user was created:

describe UserObserver do

  before(:each) do
    @observer = UserObserver.instance
  end

  it "sends notification of creation" do
    user = mock_model(User, :email_address =>
"user-hcDgGtZH8xNBDgjK7y7TUQ@public.gmane.org", ...)
    expected_attributes = {
      :id => user.id,
      :"email-address" => user.email_address,
      ...
    }
    SomeApi.should_receive(:user_created).with(:attributes =>
expected_attributes).and_return("created")
    @observer.after_create(user)
  end
end

When testing your model that this observer observes, you might want to use
the no peeping toms plugin [
http://github.com/pat-maddox/no-peeping-toms/tree/master ] to prevent
observers from being notified.

Regards,
Craig


-- 
Craig Demyanovich
Mutually Human Software
http://mutuallyhuman.com

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> @observer = UserObserver.instance
Thanks Craig that was the trick!

I don''t need NoPeepingTom as I put expectations on observer''s
method
calls so I can intercept them and just make sure that the correct 
methods are invoked.
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