Business logic for a single view can be found in a controller. Controllers are used for configuring the initial $scope object or adding behavior to $scope. DOM manipulation, however, should not be managed within controllers. For further information regarding AngularJS controllers, please read the online documentation at https://docs.angularjs.org/guide/controller. Considering what we've just discussed, tests should be focused either on modifications to the scope object or its associated behavior. A scope can be an assigned initial property that provides the view with data. These properties are then updated either via user interaction or from external services. Scope behavior is constructed by attaching methods to the scope object. This chapter will focus on how to set up a test for testing a controller and pay particular attention to the tasks we would expect to be handled within a controller.