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问题描述
我想测试是否在我的 Javascript 对象构造函数中调用了以下方法.从我在 Jasmine 文档中看到的内容来看，我可以监视构造函数方法，并且可以在实例化对象后监视方法，但我似乎无法在构造对象之前监视方法.
I want to test whether the following method is called with in my Javascript object constructor. From what I have seen in the Jasmine documentation, I can spy on a constructor method and I can spy on methods after an object has been instantiated, but I can't seem to be able to spy on a method before the object is constructed.
对象:
Klass = function() {
this.called_method();
};
Klass.prototype.called_method = function() {
//method to be called in the constructor.
}
我想在规范中做这样的事情:
I want to do something like this in the spec:
it('should spy on a method call within the constructor', function() {
spyOn(window, 'Klass');
var obj = new Klass();
expect(window.Klass.called_method).toHaveBeenCalled();
});
推荐答案
直接窥探原型方法:
describe("The Klass constructor", function() {
it("should call its prototype's called_method", function() {
spyOn(Klass.prototype, 'called_method'); //.andCallThrough();
var k = new Klass();
expect(Klass.prototype.called_method).toHaveBeenCalled();
});
});
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