validate() isn't detected by shoulda

question.rb

class Question < ActiveRecord::Base
  belongs_to :user
  has_many :answers
  #validate :text, :presence => true, :uniqueness => true
  validates_presence_of :text
  validates_uniqueness_of :text
  attr_accessible :text  
end

question_fabricator.rb

Fabricator(:question) do
  text "#{Faker::Lorem.sentence(5)}?"
  user
end

question_spec.rb

require 'spec_helper'

describe Question do
  it {should belong_to :user}
  it {should have_many :answers}
  it {should validate_presence_of :text}
  it {should validate_uniqueness_of :text}
end

test_results

Failures:

  1) Answer 
     Failure/Error: it {should belong_to :project}
       Expected Answer to have a belongs_to association called project (no association called project)
     # ./spec/models/answer_spec.rb:4:in `block (2 levels) in <top (required)>'

  2) Answer 
     Failure/Error: it {should validate_presence_of :text}
       Expected errors to include "can't be blank" when text is set to nil, got no errors
     # ./spec/models/answer_spec.rb:5:in `block (2 levels) in <top (required)>'

  3) Answer 
     Failure/Error: it {should validate_presence_of :correct}
       Expected errors to include "can't be blank" when correct is set to nil, got no errors
     # ./spec/models/answer_spec.rb:6:in `block (2 levels) in <top (required)>'

Finished in 18.91 seconds
8 examples, 3 failures

Failed examples:

rspec ./spec/models/answer_spec.rb:4 # Answer 
rspec ./spec/models/answer_spec.rb:5 # Answer 
rspec ./spec/models/answer_spec.rb:6 # Answer 
rake aborted!
ruby /Users/necromancer/.rvm/rubies/ruby-1.9.2-p290/bin/ruby -S rspec ./spec/models/answer_spec.rb ./spec/models/question_spec.rb ./spec/models/user_spec.rb failed

Tasks: TOP => spec
(See full trace by running task with --trace)