upgrade testing to es6

frontend/test/Metamaps.Import.spec.js

@@ -1,13 +1,13 @@
 /* global describe, it */
-const chai = require('chai')
-const expect = chai.expect
 
-Metamaps = {}
-require('../../app/assets/javascripts/src/Metamaps.Import')
+import chai from 'chai'
+import Import from '../src/Metamaps/Import'
+
+const { expect } = chai
 
 describe('Metamaps.Import.js', function () {
   it('has a topic whitelist', function () {
-    expect(Metamaps.Import.topicWhitelist).to.deep.equal(
+    expect(Import.topicWhitelist).to.deep.equal(
       ['id', 'name', 'metacode', 'x', 'y', 'description', 'link', 'permission']
     )
   })

package.json

@@ -5,7 +5,7 @@
   "scripts": {
     "build": "webpack",
     "build:watch": "webpack --watch",
-    "test": "mocha frontend/test || (echo 'Run `npm install` to setup testing' && false)"
+    "test": "mocha --compilers js:babel-core/register frontend/test || (echo 'Run `npm install` to setup testing' && false)"
   },
   "repository": {
     "type": "git",