feat: add unit tests for OpenApiController to validate YAML and JSON responses

tests/Controllers/OpenApiControllerTest.php

@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Siteworxpro\Tests\Controllers;
+
+use Siteworxpro\App\Controllers\OpenApiController;
+
+class OpenApiControllerTest extends ControllerTest
+{
+    public function testBuildsYaml(): void
+    {
+        $request = $this->getMockRequest('/.well-known/openapi.yaml');
+        $controller = new OpenApiController();
+
+        $response = $controller->get($request);
+
+        $this->assertEquals(200, $response->getStatusCode());
+        $this->assertStringContainsString('openapi: 3.0.0', (string)$response->getBody());
+    }
+
+    public function testBuildsJson(): void
+    {
+        $request = $this->getMockRequest(uri: '/.well-known/openapi.json');
+        $controller = new OpenApiController();
+
+        $response = $controller->get($request);
+
+        $this->assertEquals(200, $response->getStatusCode());
+        $this->assertEquals('application/json', $response->getHeaderLine('Content-Type'));
+        $this->assertNotFalse(json_decode($response->getBody()->getContents()));
+    }
+}