diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index 400a67a..13d5c4b 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -3,27 +3,8 @@
 
 use AspectMock\Kernel;
 
-include __DIR__ . '/../vendor/autoload.php'; // composer autoload
-
-if (!function_exists('uuid_create')) {
-    // Create stub of method so AspectMock can mock this function
-    // if it doesn't exist in PHP.
-    function uuid_create($type) {}
-}
-
-if (!function_exists('uuid_parse')) {
-    // Create stub of method so AspectMock can mock this function
-    // if it doesn't exist in PHP.
-    function uuid_parse($uuid) {}
-}
-
-if (!defined('UUID_TYPE_TIME')) {
-    define('UUID_TYPE_TIME', 1);
-}
-
-if (!defined('UUID_TYPE_RANDOM')) {
-    define('UUID_TYPE_RANDOM', 4);
-}
+require_once __DIR__ . '/../vendor/autoload.php'; // composer autoload
+require_once __DIR__ . '/phpstan-bootstrap.php';
 
 $kernel = Kernel::getInstance();
 $kernel->init([
diff --git a/tests/phpstan-bootstrap.php b/tests/phpstan-bootstrap.php
new file mode 100644
index 0000000..c7f0535
--- /dev/null
+++ b/tests/phpstan-bootstrap.php
@@ -0,0 +1,29 @@
+<?php
+
+if (!function_exists('uuid_create')) {
+    /**
+     * @param int $type
+     * @return string
+     */
+    function uuid_create($type = 0)
+    {
+    }
+}
+
+if (!function_exists('uuid_parse')) {
+    /**
+     * @param string $uuid
+     * @return string
+     */
+    function uuid_parse($uuid)
+    {
+    }
+}
+
+if (!defined('UUID_TYPE_TIME')) {
+    define('UUID_TYPE_TIME', 1);
+}
+
+if (!defined('UUID_TYPE_RANDOM')) {
+    define('UUID_TYPE_RANDOM', 4);
+}