title: PHP Unit Testing and Mocking with Mockery
body: <p>This could be a misunderstanding on my side about mocking. I would really appreciate an explanation regarding why mocking a nonexistent or existent class is a good thing?</p>
  
  <p>Example Scenario: Say we have one class dependent on the output of the second class, and we change the output format or whatever. Wouldn't this keep our tests succeeding although they're outdated in the first class?</p>