title: Rspec: How to suppress warnings and notices when running tests?
body: <p>I was using Mysql database before and decided to switch to Postgresql and now, when I run my tests using rspec, I getting a lot of warnings and notices.</p>
  
  <pre><code>WARNING:  there is already a transaction in progress
  NOTICE:  there is no transaction in progress
        should has link "Suspender"
  WARNING:  there is already a transaction in progress
  NOTICE:  there is no transaction in progress
        should has css "title" with text "Suspensão de anúncio"
  WARNING:  there is already a transaction in progress
  NOTICE:  there is no transaction in progress
        should has css "h1" with text "Awesome job!"
  </code></pre>
  
  <p>How can I suppress that? Is there a way, right?</p>