使用Jasmine根据参数值存根JS回调 [英] Use Jasmine to stub JS callbacks based on argument values

问题描述

我的node.js应用程序中有一个JS方法，我想进行单元测试。它对服务方法进行多次调用，每次都将该服务传递回调;回调累积结果。

I've got a JS method in my node.js app that I want to unit test. It makes several calls to a service method, each time passing that service a callback; the callback accumulates the results.

我如何使用Jasmine来存根服务方法，以便每次调用存根时，它都会调用回调，并且响应由参数？

How can I use Jasmine to stub out the service method so that each time the stub is called, it calls the callback with a response determined by the arguments?

这是（就像）我正在测试的方法：

This is (like) the method I'm testing:

function methodUnderTest() {

    var result = [];
    var f = function(response) {result.push(response)};

    service_method(arg1, arg2, f);

    service_method(other1, other2, f);

    // Do something with the results...
}

<我希望指定当使用arg1和arg2调用service_method时，存根将使用特定响应调用f回调，并且当使用other1和other2调用它时，它将使用不同的特定响应调用相同的回调。

I want to specify that when service_method is called with arg1 and arg2, the stub will invoke the f callback with a particular response, and when it is called with other1 and other2, it will invoke that same callback with a different particular response.

我也考虑使用不同的框架。 （我尝试过Nodeunit，但没有按照我的意愿去做。）

I'd consider a different framework, too. (I tried Nodeunit, but didn't get it to do what I wanted.)

推荐答案

你应该可以使用 callFake 间谍策略。在jasmine 2.0中，这看起来像：

You should be able to use the callFake spy strategy. In jasmine 2.0 this would look like:

describe('methodUnderTest', function () {
  it("collects results from service_method", function() {
    window.service_method = jasmine.createSpy('service_method').and.callFake(function(argument1, argument2, callback) {
      callback([argument1, argument2]);
    });

    arg1 = 1, arg2 = 'hi', other1 = 2, other2 = 'bye';
    expect(methodUnderTest()).toEqual([[1, 'hi'], [2, 'bye']]);
  });
});

其中 methodUnderTest 返回结果数组。

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