Use ES6 import in CssComposer tests

test/specs/css_composer/index.js

@@ -1,10 +1,10 @@
-const Models = require('./model/CssModels');
-const CssRuleView = require('./view/CssRuleView');
-const CssRulesView = require('./view/CssRulesView');
-const CssComposer = require('css_composer');
-const e2e = require('./e2e/CssComposer');
-const utils = require('./../test_utils.js');
-const Editor = require('editor/model/Editor');
+import Models from './model/CssModels';
+import CssRuleView from './view/CssRuleView';
+import CssRulesView from './view/CssRulesView';
+import CssComposer from 'css_composer';
+import e2e from './e2e/CssComposer';
+import utils from './../test_utils.js';
+import Editor from 'editor/model/Editor';
 
 describe('Css Composer', () => {
   describe('Main', () => {

test/specs/css_composer/model/CssModels.js

@@ -1,7 +1,7 @@
-var CssRule = require('css_composer/model/CssRule');
-var CssRules = require('css_composer/model/CssRules');
-var Selectors = require('selector_manager/model/Selectors');
-var Selector = require('selector_manager/model/Selector');
+import CssRule from 'css_composer/model/CssRule';
+import CssRules from 'css_composer/model/CssRules';
+import Selectors from 'selector_manager/model/Selectors';
+import Selector from 'selector_manager/model/Selector';
 
 module.exports = {
   run() {

test/specs/css_composer/view/CssRuleView.js

@@ -1,5 +1,5 @@
-var CssRuleView = require('css_composer/view/CssRuleView');
-var CssRule = require('css_composer/model/CssRule');
+import CssRuleView from 'css_composer/view/CssRuleView';
+import CssRule from 'css_composer/model/CssRule';
 
 module.exports = {
   run() {

test/specs/css_composer/view/CssRulesView.js

@@ -1,6 +1,6 @@
-const CssRulesView = require('css_composer/view/CssRulesView');
-const CssRules = require('css_composer/model/CssRules');
-const Editor = require('editor/model/Editor');
+import CssRulesView from 'css_composer/view/CssRulesView';
+import CssRules from 'css_composer/model/CssRules';
+import Editor from 'editor/model/Editor';
 
 module.exports = {
   run() {