Javascript 期待间谍，但得到了函数
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Expected a spy, but got Function
提问by Lorraine Bernard
I am trying to implement a test (1) for this module (2).
My purpose is to check if the collection is fetched when a particular event is triggered.
As you can see from my comment in (2) I get the message Error: Expected a spy, but got Function.
The module works but the test fails. any ideas?
我正在尝试为此模块 (2) 实施测试 (1)。
我的目的是检查在触发特定事件时是否获取了集合。
正如您在 (2) 中的评论中所见，我收到消息 Error: Expected a spy, but got Function.
The module works but the test failed。有任何想法吗？
(1)
(1)
// jasmine test module
describe('When onGivePoints is fired', function () {
beforeEach(function () {
spyOn(this.view.collection, 'restartPolling').andCallThrough();
app.vent.trigger('onGivePoints');
});
it('the board collection should be fetched', function () {
expect(this.view.collection.restartPolling).toHaveBeenCalled();
// Error: Expected a spy, but got Function.
});
});
(2)
(2)
// model view module
return Marionette.CompositeView.extend({
initialize: function () {
this.collection = new UserBoardCollection();
this.collection.startPolling();
app.vent.on('onGivePoints', this.collection.restartPolling);
},
// other code
});
回答by antonjs
You need to get into the actual method, which in this case is on the prototype.
您需要进入实际方法，在这种情况下是原型。
describe('When onGivePoints is fired', function () {
beforeEach(function () {
spyOn(UsersBoardCollection.prototype, 'restartPolling').andCallThrough();
app.vent.trigger('onGivePoints');
});
it('the board collection should be fetched', function () {
expect(UsersBoardCollection.prototype.restartPolling).toHaveBeenCalled();
});
});
Spying on the prototype is a nice trick you can use when you can't get to the actual instance you want to spy on.
监视原型是一个很好的技巧，当您无法访问要监视的实际实例时，可以使用它。
回答by Tabish
I was also getting the same issue but I resolved it by passing an argument in the function call. Then you have to write your test case like this in the it
我也遇到了同样的问题，但我通过在函数调用中传递一个参数来解决它。然后你必须像这样写你的测试用例it
var data = {name:"test"}
spyOn(UsersBoardCollection.prototype, "restartPolling").and.callThrough();
UsersBoardCollection.prototype.restartPolling(data);
expect(UsersBoardCollection.prototype.restartPolling).toHaveBeenCalled();
回答by bnolan
I had this bug because I had two versions of sinon loaded, or possibly i wasn't initialising sinon-jasmine correctly. When I explicitly loaded sinon and then sinon jasmine in my spec setup, it started running correctly.
我有这个错误是因为我加载了两个版本的 sinon，或者我没有正确初始化 sinon-jasmine。当我在规范设置中显式加载 sinon 和 sinon jasmine 时，它开始正常运行。
