title: Rspec testing find_or_create method
body: <p>I've checked my simplecov result and I've seen that </p>
  
  <pre><code>    record = User.where("fb_id = ? or email = ? ", params[:fb_id], params[:email]).first_or_create do |rows|
        rows.first_name = params[:first_name]
        rows.last_name = params[:first_name]
  </code></pre>
  
  <p>etc(all the variables after do |rows| ) haven't covered.</p>
  
  <p>Any ideas, how could I test this stuff ?
  <img src="https://i.stack.imgur.com/vdcmr.jpg" alt="enter image description here"></p>