title: Always get "RSolr::Error::Http - 404 Not Found" on Circleci.com
body: <p>I'm on Rails 4 and here's my <code>config/sunspot.yml</code> -- </p>
  
  <pre><code>test:
    solr:
      hostname: localhost
      port: 8981
      log_level: WARNING
      path: /solr/test
      pid_dir: &lt;%= File.join(::Rails.root, 'tmp', 'pids')%&gt;
  
    auto_index_callback: after_commit
    auto_remove_callback: after_commit
  </code></pre>
  
  <p>On circleci.com I always get the errors because of solr, so almost none of the tests pass:</p>
  
  <pre><code>RSolr::Error::Http:
  RSolr::Error::Http - 404 Not Found
  Error: Not Found
  
     URI: http://localhost:8981/solr/test/update?wt=ruby
  </code></pre>
  
  <p>How to fix it?</p>