Add ForbiddenException test

tests/DigiSignClientTest.php

@@ -7,6 +7,7 @@
 use DateTime;
 use DigitalCz\DigiSign\Exception\BadRequestException;
 use DigitalCz\DigiSign\Exception\ClientException;
+use DigitalCz\DigiSign\Exception\ForbiddenException;
 use DigitalCz\DigiSign\Exception\NotFoundException;
 use DigitalCz\DigiSign\Exception\RuntimeException;
 use DigitalCz\DigiSign\Exception\ServerException;
@@ -339,6 +340,21 @@ public function testRequestClientException(): void
         $client->request('GET', 'https://example.com/api');
     }
 
+    public function testRequestForbiddenClientException(): void
+    {
+        $response = new Response(403);
+
+        $httpClient = new Client();
+        $httpClient->addResponse($response);
+
+        $client = new DigiSignClient($httpClient);
+
+        $this->expectException(ForbiddenException::class);
+        $this->expectExceptionMessage('403 Forbidden');
+
+        $client->request('GET', 'https://example.com/api');
+    }
+
     public function testNormalizeJson(): void
     {
         $httpClient = new Client();