babel-plugin-rewire problem

.babelrc

    {
      "presets": ["es2015", "es2015-node4", "async-to-bluebird"],
      "env": {
        "test": {
          "plugins": ["babel-plugin-rewire"]
        }
      }
    }

package.json

{
  "name": "api",
  "version": "0.0.1",
  "private": true,
  "description": "New Swagger API Project",
  "keywords": [],
  "author": "",
  "license": "",
  "main": "app.js",
  "dependencies": {
    "babel-core": "^6.10.4",
    "babel-eslint": "^4.1.6",
    "babel-polyfill": "^6.3.14",
    "babel-preset-async-to-bluebird": "^1.0.0",
    "babel-preset-es2015": "^6.3.13",
    "babel-preset-es2015-node4": "^2.0.2",
    "babel-register": "^6.3.13",
    "bluebird": "^3.1.1",
    "body-parser": "^1.15.1"
  },
  "devDependencies": {
    "babel-plugin-rewire": "^1.0.0-rc-3",
    "mocha": "^2.5.3",
    "should": "^7.1.0"
  },
  "scripts": {
    "test": "NODE_ENV=test mocha --compilers js:babel-register --require babel-polyfill --require should"
  }
}

test.js

'use strict'

const should = require('should')

try {
  console.log('should through variable: ', should)
} catch (error) {
  console.log(error)
}
console.log('should through require: ', require('should'))

For some reason the should library cannot be required to variable.

To reproduce, run: npm install && npm test
To fix the import error (but break rewire functionality), comment out the rewire plugin from .babelrc