nock: Problem trying to intercept a request

Sorry if that is not the best to ask this.

But i am trying to use nock to mock the Shopify´s API, then i have some like this to get all blogs from a shop:

class Blog
  constructor: (key, pass, shop) ->
    throw new Error 'Blog missing parameters' if not pass? or not key? or not shop?
    @options =
      host: "http://#{key}:#{pass}@#{shop}.myshopify.com"
      port: 80
      method: "GET"
      path: '/admin/blogs.json'

  all: (cb) ->
    req = request @options, (res) ->
      response = ""
      res.setEncoding('utf8')
      res.on 'data', (data) ->
        response += data
      res.on 'end', ->
        error = new Error 'Request Error #{res.statusCode}' unless res.statusCode is 200
        process.nextTick ->
          cb(error, JSON.parse(response))
    req.end()

And parts of my testing they are some like this:

describe 'Receive a list of all Blogs', ->
    before ->
      @fixture = loadFixture 'blog/blogs'
      @api = nock "https://#{KEY}:#{PASSWORD}@#{STORE}.myshopify.com"
      @blog = new Blog KEY, PASSWORD, STORE


    it 'should be possible get a list of all blog like an Array', (done) ->
      @api.get('/admin/blogs.json').reply(200, @fixture)
      @blog.all (err, blogs) =>
        @api.done()
        blogs.should.be.an.instanceof Object
        done()

Sorry but i dont know what is wrong in my code, because allways get the response from the real server. But i need that my calls they are intercepting by nock to response my @fixture arrays of blogs.

Again sorry for ask that here.