title: How do I stub things in MiniTest?
body: <p>Within my test I want to stub a canned response for any instance of a class.</p>
  
  <p>It might look like something like:</p>
  
  <pre><code>Book.stubs(:title).any_instance().returns("War and Peace")
  </code></pre>
  
  <p>Then whenever I call <code>@book.title</code> it returns "War and Peace".</p>
  
  <p>Is there a way to do this within MiniTest?
  If yes, can you give me an example code snippet?</p>
  
  <p>Or do I need something like mocha?</p>
  
  <p>MiniTest does support Mocks but Mocks are overkill for what I need.</p>