ensure .env.testing is loaded for config

- load `NOTION_API_TOKEN`
- important for later tests

Author: johguentner

tests/Pest.php

@@ -1,5 +1,11 @@
 <?php
 
+use Dotenv\Dotenv;
 use FiveamCode\LaravelNotionApi\Tests\NotionApiTest;
+use Illuminate\Support\Facades\Config;
 
-uses(NotionApiTest::class)->in(__DIR__);
+uses(NotionApiTest::class)->beforeEach(function () {
+    $dotenv = Dotenv::createImmutable(__DIR__ . '/..', '.env.testing');
+    $dotenv->load();
+    Config::set('laravel-notion-api.notion-api-token', env('NOTION_API_TOKEN'));
+})->in(__DIR__);