feat: custom presets

src/Configuration/Presets.php

@@ -0,0 +1,19 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest\Configuration;
+
+use Closure;
+use Pest\Preset;
+
+final class Presets
+{
+    /**
+     * Creates a custom preset instance, and adds it to the list of presets.
+     */
+    public function custom(string $name, Closure $execute): void
+    {
+        Preset::custom($name, $execute);
+    }
+}