karma: TypeError: Cannot read property 'prototype' o

karma: TypeError: Cannot read property 'prototype' of undefined

本文关键字：prototype property TypeError Cannot read karma      更新时间：2023-09-26

我得到下面的错误，每当我试图注入我的service。

(function () {
    describe('Test', function () {
        var $scope, $state, service,ctrl;
        beforeEach(function() {
            module('moduleApp');
            module(function($provide) {
                $provide.service('AppService', service);
            });
            inject(function($rootScope,$injector,$controller,AppService) {
                $scope = $rootScope.$new();
                $state = $injector.get('$state');
                service = $injector.get('AppService');
                ctrl = $controller('MyCtrl', {
                    $scope: $scope,
                    $state: $state,
                    AppService: service
                });
            });
        });

        it('should have a working UserSession service', function() {
            expect(service).to.exist;
        });

    });
}());
错误:

TypeError: Cannot read property 'prototype' of undefined
    at Object.instantiate (bower_components/angular/angular.js:4577:82)
    at Object.<anonymous> (bower_components/angular/angular.js:4438:24)
    at Object.invoke (bower_components/angular/angular.js:4570:17)
    at Object.enforcedReturnValue [as $get] (bower_components/angular/angular.js:4422:37)
    at Object.invoke (bower_components/angular/angular.js:4570:17)
    at bower_components/angular/angular.js:4387:37
    at getService (bower_components/angular/angular.js:4529:39)
    at Object.invoke (bower_components/angular/angular.js:4561:13)
    at Context.workFn (bower_components/angular-mocks/angular-mocks.js:2524:20)
    at window.inject.angular.mock.inject (bower_components/angular-mocks/angular-mocks.js:2496:37)
Error: Declaration Location
    at window.inject.angular.mock.inject (bower_components/angular-mocks/angular-mocks.js:2489:25)
    at Context.<anonymous> (test/unit/app/views/Test.js:17:13)

你想干什么?首先你告诉karma使用一个未定义的对象service作为AppService，然后你试图从注入器获得AppService并将其分配给service ?这是一个循环。

如果被测单元是AppService，则不需要这样做:

module(function($provide) {
    $provide.service('AppService', service);
});

如果你需要这个服务，你可以简单地这样做:

inject(function($rootScope,$injector,$controller, _AppService_) {
    $scope = $rootScope.$new();
    $state = $injector.get('$state');
    service = _AppService_;
    ctrl = $controller('MyCtrl', {
        $scope: $scope,
        $state: $state,
        AppService: service
    });
});

，如果被测单元依赖于AppService，您首先构建一个模拟服务，然后使用provide，并且记住您不需要再次注入它。

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