title: Grails unit/intergration testing
body: <p>I'm trying to add unit-test and integration-test for my grails application but I have some trouble how to distinguish between both and when to use unit or integration to test my controllers actions and services.</p>
  
  <p>The tutorial I found online is not very clean. I can't find complete example to follow up.</p>
  
  <p>Can you please share helpful topics?</p>