fixed test break.

apps/basic/tests/unit/models/UserTest.php

@@ -3,12 +3,9 @@
 namespace tests\unit\models;
 
 use yii\codeception\TestCase;
-use yii\test\DbTestTrait;
 
 class UserTest extends TestCase
 {
-	use DbTestTrait;
-
 	protected function setUp()
 	{
 		parent::setUp();

framework/classes.php

@@ -174,7 +174,6 @@ return [
 	'yii\rbac\Manager' => YII_PATH . '/rbac/Manager.php',
 	'yii\rbac\PhpManager' => YII_PATH . '/rbac/PhpManager.php',
 	'yii\requirements\YiiRequirementChecker' => YII_PATH . '/requirements/YiiRequirementChecker.php',
-	'yii\test\DbTestTrait' => YII_PATH . '/test/DbTestTrait.php',
 	'yii\validators\BooleanValidator' => YII_PATH . '/validators/BooleanValidator.php',
 	'yii\validators\CompareValidator' => YII_PATH . '/validators/CompareValidator.php',
 	'yii\validators\DateValidator' => YII_PATH . '/validators/DateValidator.php',