diff --git a/tests/extension/ext/vendor2/bar/migration/migration.php b/tests/extension/ext/vendor2/bar/migration/migration.php
deleted file mode 100644
index fc27656d10..0000000000
--- a/tests/extension/ext/vendor2/bar/migration/migration.php
+++ /dev/null
@@ -1,18 +0,0 @@
-<?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.
-*
-*/
-
-namespace vendor2\bar\migration;
-
-class migration extends \phpbb\db\migration\migration
-{
-}
diff --git a/tests/extension/ext/vendor2/foo/migrations/migration.php b/tests/extension/ext/vendor2/foo/migrations/migration.php
deleted file mode 100644
index 63085497e3..0000000000
--- a/tests/extension/ext/vendor2/foo/migrations/migration.php
+++ /dev/null
@@ -1,18 +0,0 @@
-<?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.
-*
-*/
-
-namespace vendor2\foo\migrations;
-
-class migration extends \phpbb\db\migration\migration
-{
-}
diff --git a/tests/extension/ext/vendor3/bar/migration/migration.php b/tests/extension/ext/vendor3/bar/migration/migration.php
deleted file mode 100644
index e7280a7d5e..0000000000
--- a/tests/extension/ext/vendor3/bar/migration/migration.php
+++ /dev/null
@@ -1,18 +0,0 @@
-<?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.
-*
-*/
-
-namespace vendor3\bar\migration;
-
-class migration extends \phpbb\db\migration\migration
-{
-}
diff --git a/tests/extension/extension_base_test.php b/tests/extension/extension_base_test.php
index 5535c91fc5..eee38186db 100644
--- a/tests/extension/extension_base_test.php
+++ b/tests/extension/extension_base_test.php
@@ -16,6 +16,9 @@ class phpbb_extension_extension_base_test extends phpbb_test_case
 {
 	protected static $reflection_method_get_migration_file_list;
 
+	/** @var phpbb_mock_extension_manager */
+	protected $extension_manager;
+
 	public static function setUpBeforeClass()
 	{
 		parent::setUpBeforeClass();
@@ -56,18 +59,9 @@ class phpbb_extension_extension_base_test extends phpbb_test_case
 	public function data_test_suffix_get_classes()
 	{
 		return array(
-			array(
-				'vendor3/bar',
-				array('\vendor3\bar\migration\migration'),
-			),
-			array(
-				'vendor2/foo',
-				array('\vendor2\foo\migrations\migration'),
-			),
 			array(
 				'vendor2/bar',
 				array(
-					'\vendor2\bar\migration\migration',
 					'\vendor2\bar\migrations\migration',
 				),
 			),