How to check children method has been called in jasmine test cases?

Question

We use spyOn(this,"_new") to track a function call in jasmine. I need to check the children method call in jasmine. My code sample is given below,

Sample code:

function perform(option) {
   this.answer=this.perform._sum(option.a+option.b);
   console.log(this.answer);
}

My question is how to check the this.perform.sum(option.a+option.b) has been called with spyOn() in jasmine JavaScript?

I have tried the below way, but it was not worked as much I expected?

it("If we pass  arguments to the perform method, ensuring that the sum method has been called or not", function(done) {
    spyOn(this,"perform._sum");

    var option={a:10,b:6};

    this.perform(option);
    expect(this.perform._sum).toHaveBeenCalledWith(option.a,option.b);

    done();
});

But above code has not worked. And also, I had posted an issue regarding this npm-jasmine:Issues. The Question details are given below:

how to check children method has been called in jasmine test cases

Can anybody tell me, how to check the children method call in jasmine using spyOn()?