test: add header configuration test

Author: ace-of-aces

tests/Feature/HeadersTest.php

@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+use AceOfAces\LaravelImageTransformUrl\Tests\TestCase;
+
+beforeEach(function () {
+    Cache::flush();
+    Storage::fake('local');
+});
+
+it('responds with the configured headers', function () {
+
+    // Set up the headers configuration
+    config()->set('image-transform-url.headers', [
+        'Cache-Control' => 'immutable, max-age=10000, public, s-maxage=10000',
+        'X-Header' => 'Value',
+    ]);
+
+    /** @var TestCase $this */
+    $response = $this->get(route('image.transform', [
+        'options' => 'width=500',
+        'path' => 'cat.jpg',
+    ]));
+
+    $response->assertOk();
+    $response->assertHeader('Cache-Control', 'immutable, max-age=10000, public, s-maxage=10000');
+    $response->assertHeader('X-Header', 'Value');
+});