fixed test break

framework/yii/data/ActiveDataProvider.php

@@ -86,11 +86,11 @@ class ActiveDataProvider extends BaseDataProvider
 		parent::init();
 		if (is_string($this->db)) {
 			$this->db = Yii::$app->getComponent($this->db);
-		}
 			if ($this->db === null) {
 				throw new InvalidConfigException('The "db" property must be a valid DB Connection application component.');
 			}
 		}
+	}
 
 	/**
 	 * @inheritdoc