[Unit Testing] Testing Underscores. 3

Usually, when we do testing, we inject $compile, $rootScope into the beforeEach funciton();

Actually, there is a good pratice that we write _$compile_, _$rootScope_ instead of just $compile, $rootScope;

    var element;
    var $scope;
    var $rootScope;
    var $compile;
    beforeEach(module("app"))
    beforeEach(inject(function(_$compile_, _$rootScope_){
        $rootScope = _$rootScope_;
        $compile = _$compile_;
        $scope = $rootScope;
        element = angular.element("<div test-dir>{{2+5}}</div>");
        element = $compile(element)($rootScope);
    }))

_ _ doesn't really mean anything here, it does nothing. but when you assign this to a new virable $rootScope or $compile, it can be used through all the test file.

So use this and enjoy the convenient. :)