[ticket/13733] Properly test setting validate_classes to false/true

PHPBB3-13733

tests/extension/ext/vendor2/bar/migrations/bar.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace vendor2\foo\migrations;
+
+class bar
+{
+}

tests/extension/ext/vendor2/bar/migrations/foo.php

@@ -0,0 +1,54 @@
+<?php
+
+namespace vendor2\foo\migrations;
+
+class foo implements \phpbb\db\migration\migration_interface
+{
+	/**
+	 * {@inheritdoc}
+	 */
+	static public function depends_on()
+	{
+		return array();
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function effectively_installed()
+	{
+		return false;
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function update_schema()
+	{
+		return array();
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function revert_schema()
+	{
+		return array();
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function update_data()
+	{
+		return array();
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function revert_data()
+	{
+		return array();
+	}
+}