add: PolarApiNotPermittedException test

tests/Exceptions/PolarApiNotPermittedExceptionTest.php

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+use HDInnovations\LaravelPolarApi\Clients\ArticleClient;
+use HDInnovations\LaravelPolarApi\Exceptions\PolarApiNotPermittedException;
+use Illuminate\Support\Facades\Http;
+
+it('throws PolarApiNotPermittedException on 403 status', function (): void {
+    Http::fake([
+        '*' => Http::response([
+            'type'   => 'NotPermitted',
+            'detail' => 'string',
+        ], 403),
+    ]);
+
+    $client = new ArticleClient('https://api.example.com', 'your-token');
+
+    try {
+        $client->deleteArticle('1');
+    } catch (PolarApiNotPermittedException $e) {
+        expect($e->getMessage())->toBe('Not Permitted')
+            ->and($e->getType())->toBe('NotPermitted')
+            ->and($e->getDetail())->toBe('string');
+    }
+});