angularjs - 如何在指令中对隔离范围进行单元测试

Question

我正在尝试对一个简单的指令进行单元测试，但作用域中的变量始终未定义。

指令源代码:

.directive('ratingButton', ['$rootScope',


function($rootScope) {
      return {
          restrict: "E",
          replace: true,
          template: '<button type="button" class="btn btn-circle" ng-class="getRatingClass()"></button>',
          scope: {
              buttonRating: "="
          },
          link: function(scope, elem, attr) {
              scope.getRatingClass = function() {
                  if (!scope.buttonRating)
                      return '';
                  else if (scope.buttonRating.toUpperCase() === 'GREEN')
                      return 'btn-success';
                  else if (scope.buttonRating.toUpperCase() === 'YELLOW')
                      return 'btn-warning warning-text';
                  else if (scope.buttonRating.toUpperCase() === 'RED')
                      return 'btn-danger';
                  else if (scope.buttonRating.toUpperCase() === 'BLUE')
                      return 'btn-info';
              }
          }
      };
  }])

测试:

describe('Form Directive: ratingButton', function() {

    // load the controller's module
    beforeEach(module('dashboardApp'));

    var scope,
        element;

    // Initialize the controller and a mock scope
    beforeEach(inject(function($compile, $rootScope) {
        scope = $rootScope.$new();

        //set our view html.
        element = angular.element('<rating-button button-rating="green"></rating-button>');
        $compile(element)(scope);
        scope.$digest();
    }));

    it('should return appropriate class based on rating', function() {
        //console.log(element.isolateScope());
        expect(element.isolateScope().buttonRating).toBe('green');
        expect(element.isolateScope().getRatingClass()).toBe('btn-success');

    });

});

我在另一个指令单元测试中使用了类似的代码，通过元素属性传递值，并且它按预期工作。对于此测试，按钮评级始终未定义，不确定从这里该去哪里(我对 Jasmine/Karma 还很陌生)

任何帮助都会很棒!

Answer 1

而不是设置字符串 green在测试启动时编译指令元素时，将其设置在范围边界上。否则，它将查找名称为 green 的范围属性的值。在绑定(bind)范围上，当然在您的情况下没有定义。

即scope.buttonRating = 'green';

和

angular.element('<rating-button button-rating="buttonRating"></rating-button>')

尝试:

  // Initialize the controller and a mock scope
    beforeEach(inject(function($compile, $rootScope) {
        scope = $rootScope.$new();
        scope.buttonRating = 'green'; //<-- Here
        //set our view html.
        element = angular.element('<rating-button button-rating="buttonRating"></rating-button>');
        $compile(element)(scope);
        scope.$digest();
    }));

    it('should return appropriate class based on rating', function() {
        expect(element.isolateScope().buttonRating).toBe('green');
        expect(element.isolateScope().getRatingClass()).toBe('btn-success');

    });

<强> Plnkr