TypeError:在使用Karma测试AngularJS控制器时,无法读取未定义的属性'then' [英] TypeError: Cannot read property 'then' of undefined in testing AngularJS controller with Karma
问题描述
我正在尝试为从服务获得承诺的控制器编写单元测试,但在Jasmine中我得到:
I am trying to write unit tests for a controller that gets a promise from a service, but in Jasmine I am getting:
TypeError: Cannot read property 'then' of undefined
在控制器中我调用 .then()
来自服务的退货承诺。
In controller I call .then()
on returned promise from service.
有人可以帮忙吗? 。我肯定缺少明显的东西。
Can anybody help please? I am surely missing something obvious.
下面是一个普拉克:的 http://plnkr.co/edit/vJOopys7pWTrTQ2vLgXS?p=preview
Here is a plunk: http://plnkr.co/edit/vJOopys7pWTrTQ2vLgXS?p=preview
'use strict';
describe('Language controller', function() {
var scope, translationService, createController;
beforeEach(function() {
var mockTranslationService = {};
module('dictApp', function($provide) {
$provide.value('translationService', mockTranslationService);
});
inject(function($q) {
mockTranslationService.languages = [
{
name: 'slovak'
},
{
name: 'czech'
}
];
mockTranslationService.languagesWithWords = [{
name: 'slovak',
words: [{
key: 'Car',
translation: 'Auto',
createdOn: 0
}, {
key: 'Flower',
translation: 'Kvet',
createdOn: 0
}]
}, {
name: 'czech',
words: {
key: 'Plaza',
translation: 'Namesti',
createdOn: 0
}
}];
mockTranslationService.getLanguages = function() {
var deferred = $q.defer();
deferred.resolve(this.languages);
return deferred.promise;
};
});
});
beforeEach(inject(function($controller, $rootScope, _translationService_) {
scope = $rootScope.$new();
translationService = _translationService_;
createController = function () {
return $controller('LanguageCtrl',
{$scope: scope, translationService: translationService});
};
scope.$digest();
}));
it('should get the language array', function() {
spyOn(translationService, 'getLanguages');
createController();
expect(translationService.getLanguages).toHaveBeenCalled();
});
});
这是控制器:
dictControllers.controller('LanguageCtrl', ['$scope', 'translationService', function($scope, translationService){
$scope.getLanguages = function() {
translationService.getLanguages().then(function(){
$scope.languages = translationService.languages;
});
};
$scope.getLanguages();
$scope.getWords = function(language) {
translationService.getWords(language);
};
$scope.newWord = {};
$scope.addWord = function(language) {
translationService.addWord($scope.newWord, language);
$scope.newWord = {};
};
}]);
推荐答案
使用 spyOn(mockTranslationService, 'getLanguages')。and.returnValue(deferred.promise);
代替。在调用getLocations()之后而不是在 getLocations()
返回promise之前解决promise更有意义。您还应该检查语言。
Use spyOn(mockTranslationService, 'getLanguages').and.returnValue(deferred.promise);
instead. It also makes more sense to resolve the promise after the getLocations() has been called rather than before getLocations()
returns the promise. You should also check the languages.
inject(function($q) {
deferred = $q.defer();
mockTranslationService.languages = [
{
name: 'slovak'
},
{
name: 'czech'
}
];
mockTranslationService.languagesWithWords = [{
name: 'slovak',
words: [{
key: 'Car',
translation: 'Auto',
createdOn: 0
}, {
key: 'Flower',
translation: 'Kvet',
createdOn: 0
}]
}, {
name: 'czech',
words: {
key: 'Plaza',
translation: 'Namesti',
createdOn: 0
}
}];
mockTranslationService.getLanguages = function () {
};
spyOn(mockTranslationService, 'getLanguages').and.returnValue(deferred.promise);
});
it('should get the language array', function() {
createController();
deferred.resolve();
scope.$digest();
expect(translationService.getLanguages).toHaveBeenCalled();
expect(scope.languages).toEqual(translationService.languages);
});
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