我有myService使用myOtherService，它进行远程调用，返回Promise：
angular.module('app.myService', ['app.myOtherService'])
.factory('myService', [
myOtherService,
function(myOtherService) {
function makeRemoteCall() {
return myOtherService.makeRemoteCallReturningPromise();
}
return {
makeRemoteCall: makeRemoteCall
};
}
])
为了对myService我进行单元测试，我需要模拟myOtherService，这样它的makeRemoteCallReturningPromise方法就会返回一个Promise。这就是我的做法：
describe('Testing remote call returning promise', function() {
var myService;
var myOtherServiceMock = {};
beforeEach(module('app.myService'));
// I have to inject mock when calling module(),
// and module() should come before any inject()
beforeEach(module(function ($provide) {
$provide.value('myOtherService', myOtherServiceMock);
}));
// However, in order to properly construct my mock
// I need $q, which can give me a promise
beforeEach(inject(function(_myService_, $q){
myService = _myService_;
myOtherServiceMock = {
makeRemoteCallReturningPromise: function() {
var deferred = $q.defer();
deferred.resolve('Remote call result');
return deferred.promise;
}
};
}
// Here the value of myOtherServiceMock is not
// updated, and it is still {}
it('can do remote call', inject(function() {
myService.makeRemoteCall() // Error: makeRemoteCall() is not defined on {}
.then(function() {
console.log('Success');
});
}));
从上面可以看出，我的模拟的定义取决于$q，我必须使用inject(). 此外，注入模拟应该发生在module()，应该在 之前发生inject()。但是，一旦我更改它，模拟的值就不会更新。
这样做的正确方法是什么？