specHelper.js

import deepFreeze from 'deep-freeze'
import configureStore from '../app/store/'

export const reduce = (actions) => {
  const store = configureStore()
  actions.forEach(action => store.dispatch(action))
  return store.getState()
}

export const reductio = (reducer, actions) => {
  var state = reducer(undefined, {type: 'NO_SUCH_ACTION'})
  return apply(reducer, state, actions)
}

export const apply = (reducer, initialState, actions) => {
  let state = initialState
  for (var action of actions) {
    deepFreeze(state)
    state = reducer(state, action)
  }
  return state
}

store.js

switch (process.env.NODE_ENV) {
  case 'production':
    module.exports = require('./configureStore.prod')
    break

  case 'test':
    module.exports = require('./configureStore.test')
    break

  default:
    module.exports = require('./configureStore.dev')
    break
}