How do you make your testers test your app

I am working in a company which every people has his job definition. While I develop my application, I expect testers to test application in a daily basis. But generally they do test the application just before release dates. When I tell this situation at scrum meetings they got it personal.

This situation effects me because I am needed to work at releases till late night. Otherwise I would work less.

What would/did you do in similar situations?