Fixed code style issue

Author: Stanislav Idolov

app/code/Magento/Directory/Test/Unit/Model/AllowedCountriesTest.php

@@ -8,7 +8,6 @@
 
 use Magento\Directory\Model\AllowedCountries;
 use Magento\Framework\App\Config\ScopeConfigInterface;
-use Magento\Framework\Data\Collection\AbstractDb;
 use Magento\Store\Api\Data\WebsiteInterface;
 use Magento\Store\Model\ScopeInterface;
 use Magento\Store\Model\StoreManagerInterface;
@@ -30,6 +29,9 @@ class AllowedCountriesTest extends \PHPUnit\Framework\TestCase
      */
     private $allowedCountriesReader;
 
+    /**
+     * Test setUp
+     */
     public function setUp()
     {
         $this->scopeConfigMock = $this->createMock(ScopeConfigInterface::class);