title: Using in-memory PostgreSQL
body: <p>I'm new to databases, but I'm going to use PostgreSQL in my application with Hibernate. It's rather clear how to install Postgres, bind with hibernate and use it. But I can't figure out how to run in-memory Postgres database with maven for testing. Is it possible?
  If no - any advises how to test my application in this case?</p>
  
  <p>p.s. links to the corresponding tutorials are the most desirable and I'll highly appreciate them.
  Thanks!</p>