fixing some tests

tests/_app/config/db.php

@@ -0,0 +1,15 @@
+<?php
+
+$db = [
+    'class' => 'yii\db\Connection',
+    'dsn' => 'mysql:host=localhost;dbname=test',
+    'username' => 'root',
+    'password' => '',
+    'charset' => 'utf8',
+];
+
+if (file_exists(__DIR__ . '/db.local.php')) {
+    $db = array_merge($db, require(__DIR__ . '/db.local.php'));
+}
+
+return $db;