[英]How to mock Angular service method which takes parameter
我正在尝试测试Angular控制器,因此需要模拟几个服务。 我将重点关注该问题中的一项服务,其余功能类似。 我使用依赖注入来获取playersService
,并像在控制器中那样使用它:
angular.module('gameApp')
.controller('PlayerInfoController', PlayerInfoController);
PlayerInfoController.$inject = ['$scope', '$routeParams', 'playersService'];
function PlayerInfoController($scope, $routeParams, playersService) {
var vm = this;
var playerId = $routeParams.playerId;
playersService.getDetails({
playerId: playerId
}).$promise.then(function(details) {
vm.details = details;
});
}
相关服务如下所示:
angular.module('gameApp')
.factory('playersService', ['$resource',
function($resource) {
var base = '/api/players/:playererId/';
return $resource(base, {}, {
getDetails: {method: 'GET', url: base + 'details'}
});
}]);
下面是我当前的单元测试设置,失败并出现以下错误: TypeError: 'undefined' is not an object (evaluating 'playersService.getDetails({playerId: playerId}).$promise.then')
describe('PlayerInfoController', function() {
var scope;
var routeParams;
var playersService;
beforeEach(function() {
var mockPlayersService = {};
module('gameApp', function($provide) {
$provide.value('playersService', mockPlayersService);
});
inject(function($q) {
mockPlayersService.details = {
'firstName': 'John',
'lastName': 'Doe',
'country': 'US'
};
mockPlayersService.getDetails = function(playerId) {
var defer = $q.defer();
defer.resolve(this.details);
return defer.promise;
};
});
});
beforeEach(inject(function($controller, $rootScope, _$routeParams_, _playersService_) {
scope = $rootScope.$new();
routeParams = _$routeParams_;
playersService = _playersService_;
$controller('PlayerInfoController', {$scope: scope, $routeParams: routeParams, playersService: playersService});
scope.$digest();
}));
it('should say 2 === 2', function() {
expect(2).toEqual(2);
});
});
通常,在调用完成后,将使用结果填充此对象,playersService.getDetails返回一个带有$ promise属性的相对空的对象。
您的mockPlayersService.getDetails需要返回一个类似的对象,因此应执行以下操作:
mockPlayersService.getDetails = function(playerId) {
var defer = $q.defer();
defer.resolve(this.details);
return angular.extend({$promise: defer.promise}, this.details);
};
需要注意的是,根据有角度的文档,您通常像这样使用服务(第二个参数可以是调用成功的函数,而不是使用$ promise)。
playersService.getDetails({
playerId: playerId
}, function(details) {
vm.details = details;
});
这还需要您修改模拟服务。
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