title: mockery overload class missing methods
body: <p>Need a bit of help using Mockery - I want to overload a class, which is created using <code>new HelperUtil()</code> in a method. </p>
  
  <p>Using Mockery <code>overload</code> I can do this, but it is leaving me with an empty shell  class. Which I then appear to have to create all methods that are called. Is there a way to create a overloaded full mock, and then change just one method?</p>
  
  <pre><code>    $mock = \Mockery::mock('overload:'.HelperUtil::class);
      $mock-&gt;shouldReceive('content')-&gt;andReturnUsing(function() {
          return 'different content';
      });
  </code></pre>
  
  <p>thanks</p>
  
  <p>edit: 
  I think i want to do:</p>
  
  <pre><code>    $mock = \Mockery::mock('overload:'.HelperUtil::class)-&gt;shouldDeferMissing();
      $mock-&gt;shouldReceive('content')-&gt;andReturnUsing(function() {
          return 'different content';
      });
  </code></pre>
  
  <p>But that still dosnt work =(</p>