[ticket/15396] Added test for correct order of revert_schema() steps

PHPBB3-15396

tests/dbal/migration/revert_table.php

@@ -0,0 +1,39 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+class phpbb_dbal_migration_revert_table extends \phpbb\db\migration\migration
+{
+	function update_schema()
+	{
+		return array(
+			'add_tables' => array(
+				'phpbb_foobar' => array(
+					'COLUMNS' => array(
+						'module_id' => array('UINT:3', NULL, 'auto_increment'),
+						'bar_column' => array('UINT', 1),
+					),
+					'PRIMARY_KEY'	=> 'module_id',
+				),
+			),
+		);
+	}
+
+	function revert_schema()
+	{
+		return array(
+			'drop_tables'	=> array(
+				'phpbb_foobar',
+			),
+		);
+	}
+}