Karma测试:TypeError:尝试分配给readonly属性

Question

当我尝试对我的控制器进行单元测试时,我收到了错误.当我调试测试用例时,我希望得到预期的值,但是它失败了以下错误.我在这里丢失的是什么,或者我是否在错误中测试控制器变量方式？

我的spec文件如下

'use strict';
describe('Information.controller', function () {
beforeEach(angular.mock.module('asp'));
var InformationController, scope;

beforeEach(inject(function($controller, $rootScope) {
    scope = $rootScope.$new();
    InformationController = $controller('InformationController', {
        $scope: scope
    });
}));

fit('Should remove the object without info from the  object', function () {
    InformationController.Data = [
        {
            "ban": "03745645455",
            "accountNo": "0000drgyt456456565",
            "id": "2c4cc5e8-f360367"
        },
        {
            "ban": "27346fgh9080",
            "accountNo": "000456456ytr655680",
            "id": "2c4cc8ae-50bbf360367"
        }
    ];
    InformationController.banList = InformationController.Data.map((value, index) => (value && value.ban ? {'id': index, 'text': value.ban} : null))
    .filter(value => value);
    expect(InformationController.banList.length).toBe(3);
});
});

Answer 1

readonly错误是由scope.page(在我的InformationController中)未定义引起的,然后代码试图将属性分配给undefined.Hence修改了beforeEach块,如下所示

beforeEach(inject(function ($controller, $rootScope) {
        scope = $rootScope.$new();
        scope.page3 = {};
        InformationController = $controller('InformationController', {
            $scope: scope
        });
    }));

这解决了这个问题.