Fixed usage of ::className() instead of ::class

tests/framework/grid/DataColumnTest.php

@@ -26,7 +26,7 @@ class DataColumnTest extends \yiiunit\TestCase
             'dataProvider' => new ArrayDataProvider([
                 'allModels' => [],
                 'totalCount' => 0,
-                'modelClass' => Order::className()
+                'modelClass' => Order::class
             ]),
             'columns' => ['customer_id', 'total']
         ]);

tests/framework/i18n/DbMessageSourceTest.php

@@ -39,7 +39,7 @@ class DbMessageSourceTest extends I18NTest
 
     private function getMessageSourceClass()
     {
-        return DbMessageSource::className();
+        return DbMessageSource::class;
     }
 
     protected static function runConsoleAction($route, $params = [])

tests/framework/i18n/I18NTest.php

@@ -46,7 +46,7 @@ class I18NTest extends TestCase
 
     private function getMessageSourceClass()
     {
-        return PhpMessageSource::className();
+        return PhpMessageSource::class;
     }
 
     public function testTranslate()