title: How to mock MD5 hash collision
body: <p>I am using a private Ubuntu server and am testing a private application</p>
  
  <p>I am using the Python <code>hashlib</code> library for generating MD5 hashes.</p>
  
  <p>Now I want the MD5 function always return my specific number although different input. How can I do this? Is there a config file?</p>