How clear cache in test controller

Hello everyone. Today I want to discuss the problem of clearing the cache in the controller test.

What can you do, if your build doesn't build every night?

Hi.
Today I would like to tell you about the problems associated with the build definitions.
Imagine this situation.
You did build definition that runs at night every day.
One month later, when you enter to build viewer, you find that builds was executed a couple of times.
What the hell is going on!