Use ES6 import in Block tests

test/specs/asset_manager/index.js

@@ -1,7 +1,7 @@
 import StorageManager from 'storage_manager';
 import AssetManager from 'asset_manager';
 
-describe.only('Asset Manager', () => {
+describe('Asset Manager', () => {
   describe('Main', () => {
     var obj;
     var imgObj;

test/specs/block_manager/index.js

@@ -1,5 +1,5 @@
-var BlockManager = require('block_manager');
-var BlocksView = require('./view/BlocksView');
+import BlockManager from 'block_manager';
+import BlocksView from './view/BlocksView';
 
 describe('BlockManager', () => {
   describe('Main', () => {

test/specs/block_manager/view/BlocksView.js

@@ -1,6 +1,6 @@
-var Backbone = require('backbone');
-var BlocksView = require('block_manager/view/BlocksView');
-var Blocks = require('block_manager/model/Blocks');
+import Backbone from 'backbone';
+import BlocksView from 'block_manager/view/BlocksView';
+import Blocks from 'block_manager/model/Blocks';
 
 module.exports = {
   run() {