Package collision of mock-fs and body-parser

index.js

var bodyParser = require('body-parser');
var express = require('express');
var request = require('supertest');
var fs = require('mock-fs');

var app = express();
app.use(bodyParser.urlencoded({ extended: true }));
app.post('/bookmarks', function(req, res) {
  if (req.body.url && req.body.tags) {
    return res.sendStatus(201);
  } else {
    return res.sendStatus(400);
  }
});

describe('testing a simple application', function() {

  beforeEach(function() {
    fs({'C:/somedir': {'file.txt': 'hello'}});
  });
  
  afterEach(function() {
    fs.restore();
  });

  it('should succeed', function(done) {
    var payload = {
      url: 'http://some-url.com',
      tags: '#tags #tag'
    };
    request(app)
      .post('/bookmarks')
      .type('form')
      .send(payload)
      .expect(201)
      .end(done);
  });

  it('should fail', function(done) {
    request(app)
      .post('/bookmarks')
      .type('form')
      .send({})
      .expect(400)
      .end(done);
  });

});

package.json

{
  "name": "tmp-code-sample",
  "version": "0.0.1",
  "private": true,
  "description": "Package collision of mock-fs and body-parser",
  "scripts": {
    "test": "mocha *.js"
  },
  "author": "Maximilian Lenkeit <maximilian.lenkeit@gmail.com>",
  "license": "MIT",
  "dependencies": {
    "body-parser": "1.8.1",
    "express": "^4.13.0"
  },
  "devDependencies": {
    "chai": "^3.0.0",
    "mocha": "^2.2.5",
    "mock-fs": "^3.0.0",
    "supertest": "^1.0.1"
  }
}