A note on testing controllers

Integration tests will fail with a funny message…

grails testing Cannot send redirect – response is already committed

… if you forget to add a return statement to your controller action after you do a redirect – like so:

def handleLogin = {
        def person = Person.findByPersonName(params.personName)
        if(!person){
            flash.message = "Person not found for Person-name: ${params.personName}"
            redirect(action: "login")
            return <------//-----//-----//-----//
        }
        session.person = person
        redirect(controller: 'todo')
}

Note: This is a special case as program code that´s embeded into a control block like the above if-statement isn´t returning anything. So you need to be explicit and put in a return statement.