title: logging while running `cargo test`
body: <pre><code>#[macro_use]
  extern crate log;
  
  fn whatever() {
      info!("whatever")
  }
  
  #[test]
  fn test() {
      whatever();
  }
  </code></pre>
  
  <p>I want to see the log after running unit tests (<code>cargo test</code>),
  how is it possible <em>now</em>?</p>