$ event.stopPropogation不是Angularjs单元测试中的函数错误

Question

我正在尝试对绑定到ngClick指令的函数进行单元测试.它现在看起来像这样,因为我们刚刚开始这个项目,在我到达目前之前我想要一些测试覆盖:

vm.open = function($event) {
            $event.preventDefault();
            $event.stopPropagation();
            vm.opened = true;   
        };

我这样单元测试:

describe('Unit: simpleSearchController', function(){
//include main module
beforeEach(module('myApp'));
var ctrl, scope, event ;
// inject the $controller and $rootScope services
// in the beforeEach block
beforeEach(inject(function($controller, $rootScope){
    // Create a new scope that's a child of the $rootScope
    scope = $rootScope.$new();
    // Create the controller and alias access using controllerAs
    ctrl = $controller('simpleSearchController as vm', {
        $scope: scope
    });
}));
// unit tests
it('should set vm.opened to true', function(){
    event = scope.$broadcast("click");
    expect(event).toBeDefined();
    scope.vm.open(event);
    expect(event.defaultPrevented).toBeTruthy();
    expect(scope.vm.opened).toBeTruthy();
});
});

当Karma运行测试时,我收到此错误:

TypeError: $event.stopPropagation is not a function. 

有任何想法吗？

Answer 1

您的问题是stopPropagation该$broadcasted事件没有方法.广播向下传播和停止传播(可用$emit)用于防止进一步向上传播.所以你有2个选择.

要么使用 $emit

  it('should set vm.opened to true', function(){
        event = scope.$emit("click");
        expect(event).toBeDefined();
        scope.vm.open(event);
        expect(event.defaultPrevented).toBeTruthy();
        expect(scope.vm.opened).toBeTruthy();
  });

或者只是为事件创建一个模拟对象.

  it('should set vm.opened to true', function(){
            event = jasmine.createSpyObj('event', ['preventDefault', 'stopPropagation']);
            scope.vm.open(event);
            expect(event.preventDefault).toHaveBeenCalled();
            expect(scope.vm.opened).toBeTruthy();
      });

另请注意,您确实不需要测试,expect(event.defaultPrevented).toBeTruthy();或者expect(event).toBeDefined();因为这是在调用preventDefault且已经过测试时的核心角度功能.