AngularJS - 如何测试一个函数是否从另一个函数中调用? [英] AngularJS - How to test if a function is called from within another function?

问题描述

我正在尝试开始使用 karma-jasmine，但我想知道为什么这个测试会失败:

I'm trying to get started with karma-jasmine and I'm wondering why this test fails:

it("should call fakeFunction", function() {
    spyOn(controller, 'addNew');
    spyOn(controller, 'fakeFunction');
    controller.addNew();
    expect(controller.fakeFunction).toHaveBeenCalled();
});

在我之前为此测试设置的控制器中，我有以下内容:

In my controller that I've previously set up for this test I have the following:

function addNew() {
    fakeFunction(3);
}

function fakeFunction(number) {
    return number;
}

addNew 和 fakeFunction 都使用:

vm.addNew = addNew;
vm.fakeFunction = fakeFunction;

但是，测试失败并显示以下内容:

The test, however, fails with the following:

预期的间谍 fakeFunction 已被调用.

如果我在测试中调用该函数，我可以使测试通过.但是，我希望可以测试 fakeFunction 是否被另一个函数调用.实现这一目标的正确方法是什么?

I can make the test pass if I call the function from within my test. I was hoping, however, I could test if fakeFunction was called by another function. What is the proper way to achieve this?

更新:

//test.js

beforeEach(function() {

    module("app");

    inject(function(_$rootScope_, $controller) {

        $scope = _$rootScope_.$new();
        controller = $controller("CreateInvoiceController", {$scope: $scope});

    });

});

如果我测试类似:

it('should say hello', function() {
    expect(controller.message).toBe('Hello');
});

如果我将以下内容放入控制器中，则测试通过:

The test passes if I put the following in my controller:

var vm = this;
vm.message = 'Hello';

我只想知道如何测试公共函数是否被另一个函数调用.

I just want to know how I can test if a public function was called from another function.

推荐答案

你的 addNew 方法正在调用 fakeFunction.但是，它没有调用 controller.fakeFunction，这是您的期望.

Your addNew method is calling fakeFunction. However, it is not calling controller.fakeFunction, which is what your expectation is.

您需要更改代码以使用您的控制器，而不是这些独立的功能.

You'll need to change your code to use your controller, rather than these independent functions.

EDIT:您还需要不要监视您的 addNew 函数.这导致该功能被间谍替换.另一种选择是将其更改为:

EDIT: You also need to not spy on your addNew function. This is causing the function to be replaced with a spy. The other alternative is to change it to:

spyOn(controller, 'addNew').and.callThrough()

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