Sinon fake server making fixtures fail on another spec file!

samplespec.coffee

define [
  'backbone'
  'framework/entities/entities'
], (Backbone) ->

  beforeEach ->
    # Start the sandbox, telling it to use a fake server
    @sandbox = sinon.sandbox.create()
    @sandbox.useFakeServer()

  afterEach ->
    @sandbox.restore() # I'm restoring the sandbox, so the fake server is retored too!

  describe "Sample spec", ->

    it "using Sinon fake server is making my fixtures fail on other spec files :(", ->
      # Sinon JS documentation tells to use sandbox.server, but it does not exist.
      # I'm using sandbox.serverPrototype instead
      @sandbox.serverPrototype.respondWith("GET", "/test", [
        200,
        {
          "Content-Type": "application/json"
        },
        '{}'
      ])
      
      # This is just a sample spec. I'm overwriting Backbone.sync method
      # to add a _fetchPromise property on the entity on .fetch()
      class Mock extends Backbone.Model
        url: '/test'

      mockEntity = new Mock
      mockEntity.fetch()

      should = require('chai').should()
      should.exist mockEntity._fetchPromise

Forget it. It's my fault. beforeEach and afterEach blocks are not inside describe, so they are global for all specs.

So sorry.