Use ES6 import in Commands tests

test/specs/commands/index.js

@@ -1,7 +1,7 @@
 import Backbone from 'backbone';
-var Commands = require('commands');
-var Models = require('./model/CommandModels');
-var CommandAbstract = require('./view/CommandAbstract');
+import Commands from 'commands';
+import Models from './model/CommandModels';
+import CommandAbstract from './view/CommandAbstract';
 
 describe('Commands', () => {
   describe('Main', () => {

test/specs/commands/model/CommandModels.js

@@ -1,5 +1,5 @@
-const Command = require('commands/model/Command');
-const Commands = require('commands');
+import Command from 'commands/model/Command';
+import Commands from 'commands';
 
 module.exports = {
   run() {

test/specs/commands/view/CommandAbstract.js

@@ -1,5 +1,5 @@
 import CommandAbstract from 'commands/view/CommandAbstract';
-const Editor = require('editor/model/Editor');
+import Editor from 'editor/model/Editor';
 
 module.exports = {
   run() {