[英]Having problems unit testing a promise call in angularjs controller
SupportedLanguagesServices
get方法返回一个promise
,该promise
在控制器中如下解析:
angular.module('App').controller('MyController', ['SupportedLanguagesService',
function(SupportedLanguagesService) {
var self = this;
self.supportedLanguages = [];
SupportedLanguagesService.get().success(
function(response) {
self.supportedLanguages = response;
});
}]);
这是我编写的测试,但是没有用:
describe('Controller: MyController', function() {
beforeEach(module('App'));
var rootScope, controller;
beforeEach(inject(function($controller, $rootScope, SupportedLanguagesService, $q) {
var deferred = $q.defer();
deferred.resolve([{name:"English", code:"en"},{name:"Portugues", code:"pt_BR"]);
spyOn(SupportedLanguagesService, 'get').andReturn(deferred.promise);
rootScope = $rootScope;
controller = $controller;
}));
it('should get SupportedLanguages', function() {
rootScope.$digest();
var ctrl = controller('MyController');
expect(ctrl.supportedLanguages.length).toEqual(2);
});
});
它在语句上引发异常: var ctrl = controller('MyController');
谢谢您的帮助。
success
含义(这是$http
回调),您可以更改为then
,所有promise都可用。 这将使您轻松地兑现承诺(而不必担心$httpBackend
:
SupportedLanguagesService.get().then(
function(response) {
self.supportedLanguages = response.data;
});
然后,您需要使用控制器的构造函数, 然后调用$digest
。 因此,切换到该选项应该可以帮助您:
it('should get SupportedLanguages', function() {
var ctrl = controller('MyController');
rootScope.$digest();
expect(ctrl.supportedLanguages.length).toEqual(2);
});
您还可以使用$q.when
简化设置代码:
var response = [{name:"English", code:"en"},{name:"Portugues", code:"pt_BR"}];
spyOn(SupportedLanguagesService, 'get').andReturn($q.when(response));
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