模拟内部依赖 [英] Mock internal dependency

问题描述

我有一个内部依赖于Facebook图形对象的请求，该对象对FB graph API执行另一个请求.

I have a request that has an internal dependency to a Facebook graph objects that performs another request against the FB graph API.

我想知道是否可以使用sinon模拟图形对象，以便它实际上不会在测试中执行请求，而是使用我在测试中提供的值执行回调函数. /p>

I'm wondering if it is possible to use sinon to mock the graph object so that it wouldn't actually perform a request in a test but would execute the callback function with a value that I provide in the test instead.

server.post("/facebookLogin", function(req, res) {
    graph.setAccessToken(req.body.fbtoken);

    graph.get("me?fields=email", function(err, obj) {
        if (!err) {
            var email = obj.email;

            checkUserAlreadyRegistered(email, function(user) {
                if (user) {
                    return res.send(200, {user:user, token: decorateToken(user.id)});
                } else {
                    return res.send(404);
                }            
            });
        } else {
            return res.send(500);
        }        
    });
});

推荐答案

我遇到了完全相同的问题，并深入研究了fbgraph源代码，我

I had the exact same issue, and digging into the fbgraph source code I found out that even though it's using "graphql", internally is a network request with request so you can easily intercept it with nock:

// https://github.com/criso/fbgraph/blob/master/lib/graph.js#L34 <-- fb graph url

const fbMock = nock('https://graph.facebook.com/v4.0/')
 .get('/me')
 .query(true)
 .reply(200, {
   id: '123123',
   name: 'fb username',
   email: '[e-mail]'
 })

it('should not call fb"', (done) => {

  chai.request(server)
   .post('/facebookLogin')
   .send({ fbtoken: 'token_fb' })
   .end((err, res) => {
     expect(err).to.be.null
     expect(res).to.have.status(200)
     expect(fbMock).to.have.been.requested
     done()
   })
}

注意: /v4.0/部分可能会有所不同，具体取决于您的配置，但默认值为2.9，因此请确保使用与

note: the /v4.0/ part could be different depending on your configuration but the default value is 2.9 so be sure to use the same one you set with the setVersion method

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