Workflow (validators & post-functions)

There are several different ways of blocking the issue workflow transition:

• Block transition if any item from the checklist is not completed (built-in validator).
• Block transition if the mandatory item is not completed (built-in validator)
• Block transition if the checklist is empty (build-in validator). 
• Block transition using regular expression (custom validator; allows to make particular items optional or check if there are any items).

Also, there is a way to complete all items automatically when the issue gets resolved (or transitioned):

• Complete all items automatically when the issue is transitioned (e.g. resolved)