MAGETWO-46846: Unable to use inline translation for checkout in a recommended way

- Added unit test.
- Fixed code style

Author: Hayder Sharhan

app/code/Magento/Translation/Model/Inline/CacheManager.php

@@ -11,16 +11,24 @@
  */
 class CacheManager
 {
-    /** @var \Magento\Framework\Event\ManagerInterface */
+    /**
+     * @var \Magento\Framework\Event\ManagerInterface
+     */
     protected $eventManager;
 
-    /** @var \Magento\Framework\Translate\ResourceInterface */
+    /**
+     * @var \Magento\Framework\Translate\ResourceInterface
+     */
     protected $translateResource;
 
-    /** @var \Magento\Framework\Locale\ResolverInterface */
+    /**
+     * @var \Magento\Framework\Locale\ResolverInterface
+     */
     protected $localeResolver;
 
-    /** @var \Magento\Translation\Model\FileManager $fileManager */
+    /**
+     * @var \Magento\Translation\Model\FileManager
+     */
     protected $fileManager;
 
     /**

app/code/Magento/Translation/Test/Unit/Model/Inline/CacheManagerTest.php

@@ -0,0 +1,83 @@
+<?php
+/**
+ * Copyright © 2015 Magento. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+namespace Magento\Translation\Test\Unit\Model\Inline;
+
+/**
+ * @covers \Magento\Translation\Model\Inline\CacheManager
+ */
+class CacheManagerTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @var \Magento\Translation\Model\Inline\CacheManager
+     */
+    protected $model;
+
+    /**
+     * @var \Magento\Framework\Event\ManagerInterface|\PHPUnit_Framework_MockObject_MockObject
+     */
+    protected $eventManagerMock;
+
+    /**
+     * @var \Magento\Framework\Translate\ResourceInterface|\PHPUnit_Framework_MockObject_MockObject
+     */
+    protected $translateResourceMock;
+
+    /**
+     * @var \Magento\Framework\Locale\ResolverInterface|\PHPUnit_Framework_MockObject_MockObject
+     */
+    protected $localeResolverMock;
+
+    /**
+     * @var \Magento\Translation\Model\FileManager|\PHPUnit_Framework_MockObject_MockObject
+     */
+    protected $fileManagerMock;
+
+    protected function setUp()
+    {
+        $this->eventManagerMock = $this->getMockBuilder('Magento\Framework\Event\ManagerInterface')
+            ->disableOriginalConstructor()
+            ->setMethods([])
+            ->getMock();
+
+        $this->translateResourceMock = $this->getMockBuilder('Magento\Framework\Translate\ResourceInterface')
+            ->disableOriginalConstructor()
+            ->setMethods([])
+            ->getMock();
+
+        $this->localeResolverMock = $this->getMockBuilder('Magento\Framework\Locale\ResolverInterface')
+            ->disableOriginalConstructor()
+            ->setMethods([])
+            ->getMock();
+
+        $this->fileManagerMock = $this->getMockBuilder('Magento\Translation\Model\FileManager')
+            ->disableOriginalConstructor()
+            ->setMethods([])
+            ->getMock();
+
+        $objectManagerHelper = new \Magento\Framework\TestFramework\Unit\Helper\ObjectManager($this);
+        $this->model = $objectManagerHelper->getObject(
+            'Magento\Translation\Model\Inline\CacheManager',
+            [
+                'eventManager' => $this->eventManagerMock,
+                'translateResource' => $this->translateResourceMock,
+                'localeResolver' => $this->localeResolverMock,
+                'fileManager' => $this->fileManagerMock
+            ]
+        );
+    }
+
+    public function testUpdateAndGetTranslations()
+    {
+        $translations = ['phrase1' => 'translated1', 'phrase2' => 'translated2'];
+
+        $this->eventManagerMock->expects($this->once())->method('dispatch');
+        $this->translateResourceMock->expects($this->once())->method('getTranslationArray')->willReturn($translations);
+        $this->localeResolverMock->expects($this->once())->method('getLocale')->willReturn('en_US');
+        $this->fileManagerMock->expects($this->once())->method('updateTranslationFileContent');
+        $this->assertEquals($translations, $this->model->updateAndGetTranslations());
+    }
+}