Rails - Mar 2006 - Unit tests dynamic finders

Hi all,
I am having a problem with unit tests. Whenever I have a dependency 
between two models (B depends on A) deleting A should also delete B. 
This is simple with the dependent parameter in the model file of A. But 
when I write a test the dependency seems to work, I can''t find the 
answer with id 1 anymore(Answer.find(1)). But I appearently _do_ find it 
with Answer.find_by_question_id(1) or Answer.find(:first, :conditions => 
"question_id = 1"). What am I doing wrong??
Below you will find the relevant files used in testing.

questions.yml:
first_question:
  id: 1
  question: "Will fixture files work?"
  answer: "No"

answers.yml:
first_answer:
  id: 1
  question_id: 1

question_test.rb:
class QuestionTest < Test::Unit::TestCase
    fixtures :categories, :questions, :answers

    def test_destroy
        question = questions(:first)
        id = question.id
        question.destroy
        assert_raise(ActiveRecord::RecordNotFound) {Question.find(1)}
        assert_raise(ActiveRecord::RecordNotFound) {Answer.find(1)}
        assert_raise(ActiveRecord::RecordNotFound) 
{Answer.find_by_question_id(1)} <<TROUBLE, ACTUALLY SUCCEEDS
        #assert_raise(ActiveRecord::RecordNotFound) {Answer.find(:all, 
:conditions => "question_id = 1" )} <<AND AGAIN TROUBLE
    end
end

question.rb:
class Question < ActiveRecord::Base
    has_one :answer, :dependent => true
end

With many thanks,

Harm

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