diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index 9127621..b62c4ff 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -38,6 +38,15 @@
 
 DG\BypassFinals::enable();
 
+// Core files
+require_once $_core_dir.'/wp-includes/formatting.php';
+require_once $_core_dir.'/wp-includes/functions.php';
+require_once $_core_dir.'/wp-includes/l10n.php';
+require_once $_core_dir.'/wp-includes/load.php';
+require_once $_core_dir.'/wp-includes/plugin.php';
+require_once $_core_dir.'/wp-includes/pomo/translations.php';
+
+// Class files
 require_once $_core_dir.'/wp-admin/includes/class-wp-filesystem-base.php';
 require_once $_core_dir.'/wp-admin/includes/class-wp-filesystem-direct.php';
 require_once $_core_dir.'/wp-admin/includes/class-wp-site-icon.php';
@@ -52,7 +61,4 @@
 require_once $_core_dir.'/wp-includes/class-wp-term.php';
 require_once $_core_dir.'/wp-includes/class.wp-dependencies.php';
 require_once $_core_dir.'/wp-includes/class.wp-scripts.php';
-require_once $_core_dir.'/wp-includes/formatting.php';
-require_once $_core_dir.'/wp-includes/functions.php';
-require_once $_core_dir.'/wp-includes/load.php';
 require_once $_core_dir.'/wp-includes/rest-api/class-wp-rest-request.php';
diff --git a/tests/constants.php b/tests/constants.php
index 0e94ba9..ae2bc3a 100644
--- a/tests/constants.php
+++ b/tests/constants.php
@@ -14,6 +14,7 @@
 // WordPress constants
 
 define('ABSPATH', '/tmp/wordpress/');
+define('WP_DEBUG', false);
 define('WPINC', 'wp-includes');
 
 define('MINUTE_IN_SECONDS', 60);