使用 Sinon 在 javascript 中存根 Redis 交互 [英] Stubbing Redis interactions in javascript using Sinon

问题描述

我在 node.js 中工作.我的应用程序通过 node_redis 模块与 Redis 交互.我正在使用 mocha 和 sinon 来自动测试我的应用程序.我的应用看起来像这样:

I am working in node.js. My app interacts with Redis via the node_redis module. I'm using mocha and sinon to automate testing of my app. My app looks something like this:

...snip
var redisClient = redis.createClient(redisPort, redisHost);
var someValue = redisClient.get("someKey");
return someValue;
....

我想存根对 redisClient.get() 的调用.为此，我还需要存根对 redis.createClient() 的调用 - 我认为...这是我的测试代码:

I want to stub the call to redisClient.get(). To do this I also need to stub the call to redis.createClient() - I think... Here's my test code:

...
var redis = require("redis");
var redisClient;
...
sinon.stub(redisClient, 'get').returns("someValue");
sinon.stub(redis, "createClient").returns(redisClient);
...
assert.equal(redis_client_underTest.call_to_redis(), "someValue");
...

测试失败，AssertionError: false == "someValue"

我如何存根 redisClient，或者这是否可能?

How do I stub out redisClient, or is this even possible?

推荐答案

你可以做的是使用类似Proxyquire 或 重新布线.我将使用 rewire 作为示例.

What you could do is use something like Proxyquire or Rewire. I'll be using rewire for the example.

您想要存根的代码片段:

Your snippet of code you want to stub:

var redisClient = redis.createClient(redisPort, redisHost);
var someValue = redisClient.get("someKey");
return someValue;

然后在你的测试中你可以使用 rewire:

Then in your test you can use rewire:

var Rewire = require('rewire');

var myModule = Rewire("../your/module/to/test.js");

var redisMock = {
    get: sinon.spy(function(something){
             return "someValue";
         });
};

myModule.__set__('redisClient', redisMock);

这样你就可以替换你的 redisClient 并且你可以检查该函数是否被调用.

This way you can have your redisClient replaced and you can check with the spy if the function was called.

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