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

问题描述

我在node.js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自动测试我的应用程序。我的应用程序看起来像这样：

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;
....

我想将调用存根到redisClient.get（）。要做到这一点，我还需要将调用存根到redis.createClient（） - 我想......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

如何存根 redisClient ，或者这是否均匀可能吗？

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

推荐答案

你能做的就是使用像 Proxyquire 或 Rewire 。我将使用重新连接作为示例。

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重新连线：

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);

这样你可以更换你的redisClient，你可以检查调用该函数的间谍。

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

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