title: Rails 4 RSpec warning: you should require 'minitest/autorun' instead
body: <p>In trying to run RSpec on Rails 4, I immediately get a warning:</p>
  
  <pre><code>you should require 'minitest/autorun' instead
  </code></pre>
  
  <p>that comes up in the backtrace assigned to the line</p>
  
  <pre><code>require 'rspec/rails'
  </code></pre>
  
  <p>in <code>spec_helper.rb</code>  If I add this before it</p>
  
  <pre><code>require 'minitest/autorun'
  </code></pre>
  
  <p>the warning goes away. Is this a fix? Should I also remove the line</p>
  
  <pre><code>require 'rspec/autorun'
  </code></pre>
  
  <p>that follows? Alternatively, the problem goes away without changing the <code>spec_helper.rb</code> file if I add</p>
  
  <pre><code>gem 'minitest'
  </code></pre>
  
  <p>to the gemfile</p>
  
  <p>It will do this with a single spec file that only contains</p>
  
  <pre><code>require 'spec_helper'
  </code></pre>
  
  <p>We're running Rails 4.1.0.beta.</p>