问题描述
这肯定已经问过，但我无法找到它。我需要模拟一个工厂，但模拟本身需要使用$ Q和我结束了一个鸡和蛋的情况与问候调用注射后模块（）（）
Surely this has been asked before but I can't find it. I need to mock a factory, but the mock itself needs to use $q, and I end up in a chicken and egg situation with regards to calling module() after inject().
我看着这个question该建议做一个spyOn，该工程的服务，因为它是一个单身，但我打电话新由我厂返回功能，每次都创建一个新的实例，这样就不会工作...
I looked at this question which advises doing a spyOn, which works for services because it is a singleton, but I am calling new on the function returned by my factory, creating a new instance each time, so that won't work...
var app = angular.module('app', []);
app.factory('MyDependencyFactory', function() {
return function() {
this.doPromise = function () {
var defer = $q.defer();
//obviously more complicated.
defer.resolve();
return defer.promise;
}
}
});
app.factory('MyConsumingFactory', function(MyDependencyFactory) {
return function() {
var dependency = new MyDependencyFactory();
this.result;
this.doSomething = function () {
dependency.doPromise().then(
function (data) {
this.result = data;
},
function (error) {
console.log(error);
}
);
}
}
});
茉莉花测试：
describe('MyConsumingFactory', function() {
var MyConsumingFactory;
beforeEach(function () {
module('app');
inject( function (_MyConsumingFactory_) {
MyConsumingFactory = _MyConsumingFactory_;
});
inject( function ($q) {
mockMyDependencyFactory = function () {
this.doPromise = function (data) {
var defer = $q.defer();
defer.resolve('mock data');
};
};
});
module( function ($provide) {
$provide.factory('MyDependencyFactory', mockMyDependencyFactory);
});
});
it('works correctly', function () {
MyConsumingFactory.doSomething();
$rootScope.$apply();
expect(MyConsumingFactory.result).toEqual('mock data');
});
});
我需要我的mockMyDependencyFactory使用$ Q，所以我需要把它包在注入（功能（... ，然后我需要调用的模块（函数之前做到这一点（$提供）{... 这当然给我：
I need my mockMyDependencyFactory to use $q, so I need to wrap it in inject( function(..., and I need to do this before the call to module( function ($provide) {... which of course give me:
错误：已创建的喷油器，无法注册模块
我如何避开这个问题有什么建议？
Any suggestions on how I get round this?
或者，如果你觉得我的设计有缺陷的（我想我可以实例化一个MyDependencyFactory并传递MyConsumingFactory化期间，而不是采用了棱角分明的DI吗？）我所有的耳朵：）
Or if you think my design flawed (I suppose I could instantiate a MyDependencyFactory and pass that during instantiation of MyConsumingFactory instead of using angular's DI?) I'm all ears :)
推荐答案
）首先，为模块的所有呼叫（前应注（），否则你会得到这个错误：喷油器已经创建，无法注册模块如您在注射之前应该注册模块！在code。知道了这一点，我们需要注射前嘲弄 MyDependencyFactory ，但我们怎样才能 $ Q 在那里，如果它只是在可注入（）？实际上，它是在角测试的常用技术，以注射服务分配到一个测试套件一个全局变量，然后在所有情况下使用它：
First of all, all your calls to module() should be before inject(), otherwise you will get this error: Injector already created, can not register a module! i.e. you should register modules before you inject them in code. Knowing that, we need to mock MyDependencyFactory before injecting, but how do we get $q in there if it is only available in inject()? Actually, it is a common technique in angular tests, to assign injected service to a global variable in a test suite, and then use it across all scenarios:
describe('some suite', function () {
// "global" variables for injected services
var $rootScope, $q;
beforeEach(function () {
module('app');
module(function($provide) {
$provide.factory('MyDependencyFactory', function () {
return function () {
this.doPromise = function (data) {
// use "globals"
var defer = $q.defer();
defer.resolve('mock data');
return defer.promise;
};
};
});
});
inject(function (_$rootScope_, _$q_) {
// assign to "globals"
$rootScope = _$rootScope;
$q = _$q;
});
});
// ....
});
您可以使用 $ Q 的原因 $提供块是它没有被立即使用，它会当你调用一个模拟的方法或创建一个嘲笑对象的实例只能使用。到那个时候，它会被注入并分配给全局变量 $ Q ，并有适当的值。
The reason you can use $q in a $provide block is that it is not being used immediately, it will be used only when you call a mocked method or create an instance of a mocked object. By that time, it will be injected and assigned to a global variable $q and have an appropriate value.
还有一招，如果你想用不同的值多次化解你的承诺，你可以做的，就是要创建一个全局变量延迟并初始化它里面没有具体的方法，但在某些 beforeEach 块，然后执行 defer.resolve（'东西'）用值的情况下，你里面想在这个特定的场景。
One more trick you could do if you want to resolve your promise with different values several times, is to create a global variable defer and initialize it not inside specific method, but in some beforeEach block, and then do defer.resolve('something') inside your scenario with a value you want in this particular scenario.
的工作示例，我做了一些额外的修复，使其工作（有评论）。
Here you can see a working example of your code, I've made some extra fixes to make it work (has comments).
请注意：我说的全局变量，但它不是一个特定的测试套件中实际上全球在JS术语，但全球
Note: I am saying "global" variable, but it is not actually global as in JS terminology, but global within a particular test suite.
这篇关于模拟角度工厂使用$ Q在茉莉花的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！