title: Ultimate DRY model rspec
body: <p>I'm refactoring my model rspecs as to be "as DRY" as possible, leading to something like</p>
  
  <pre><code>require 'spec_helper'
  
  describe Model do
    subject { build(:model) }
  
    it { should be_valid }
  
    it { should validate_presence_of(:description) }
    it { should ensure_length_of(:description).is_at_least(3).is_at_most(255) }
  
    it { should validate_presence_of(:position) }
    it { should validate_numericality_of(:position).is_greater_than_or_equal_to(1) }  
  end
  </code></pre>
  
  <p>Now, every file starts with </p>
  
  <pre><code>  subject { build(:model) }
  
    it { should be_valid }
  </code></pre>
  
  <p>so, you guess it, I would like to get rid of these two lines as well...</p>
  
  <p>Any suggestions?</p>