Using jasmine to monitor constructors - spying on a constructor using Jasmine

problem ：

I am using Jasmine to test if certain objects are created and methods are called on them. I am using Jasmine To test whether some objects are created and their methods are called .

I have a jQuery widget that creates flipcounter objects and calls the setValue method on them. I have one jQuery The widget , It creates flipcounter Object and call their setValue Method .The code for flipcounter is here: https://bitbucket.org/cnanney/apple-style-flip-counter/src/13fd00129a41/js/flipcounter.jsflipcounter The code is here ： https ：//bitbucket.org/cnanney/apple-style-flip-counter/src/13fd00129a41/js/flipcounter.js

The flipcounters are created using:flipcounters Create ：

var myFlipCounter = new flipCounter("counter", {inc: 23, pace: 500});

I want to test that the flipcounters are created and the setValue method is called on them. I want to test creation flipcounters And call setValue Method .My problem is that how do I spy on these objects even before they are created? My problem is how to monitor these objects before creating them ？Do I spy on the constructor and return fake objects? Will I monitor constructors and return fake objects ？Sample code would really help. The sample code will really help .Thanks for your help! Thanks for your help ！:):)

Update: to update ：

I've tried spying on the flipCounter like this: I've tried surveillance like this flipCounter 了 ：

myStub = jasmine.createSpy('myStub');spyOn(window, 'flipCounter').andReturn(myStub);//expectationexpect(window.flipCounter).toHaveBeenCalled();

Then testing for the setValue call by flipCounter: And then through flipCounter test setValue call ：

spyOn(myStub, 'setValue');//expectationexpect(myStub.setValue).toHaveBeenCalled();

the first test for initializing flipCounter is fine, but for testing the setValue call, all I'm getting is a 'setValue() method does not exist' error. initialization flipCounter The first test of is very good , But to test setValue call , What I got was 'setValue（） Method does not exist ' error .Am I doing this the right way? Is it right for me to do this ？Thanks! thank you ！

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Solution ：

Reference resources ： https://stackoom.com/en/question/dDkF