您需要间谍来测试是否已在Jasmine中调用了函数吗? [英] Do you need spies to test if a function has been called in Jasmine?

问题描述

我正在学习茉莉花，想知道以下测试是否有效?如果没有，有人可以解释为什么吗?我一直在阅读许多教程，找不到很好的解释，这可以帮助我理解为什么我似乎无法正确编写下面的测试.

Am learning Jasmine, wondering if the following test would be valid? And if not, can someone explain why? I've been reading a number of tutorials and can't find a good explanation that has helped me understand why I can't seem to write a test like the one below correctly.

// spec
describe("when cart is clicked", function() {
    it("should call the populateNotes function", function() {
        $("#show-cart").click()
        expect(populateNotes()).toHaveBeenCalled();
    })
})

// code
$("#show-cart").click(function() {
    populateNotes();
})

推荐答案

您需要做两件事，首先需要在单击之前监视该函数.通常，您会监视像这样的函数，该函数是对象的成员. populateNotes在哪里定义?您需要以某种方式对其进行引用.

You need to do two things, first you need to spy on the function before the click. Normally you would spy on a function like this that is a member of an object. Where is populateNotes defined? You need a reference to it somehow.

// This might work, if the function is defined globally. 
spyOn(window, 'populateNotes');

// Then do your action that should result in that func being called
$("#show-cart").click();

// Then your expectation. The expectation should be on the function
// itself, not on the result. So no parens.
expect(window.populateNotes).toHaveBeenCalled();

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