add more test

Author: miladrahimi

src/Services/HttpPublisher.php

@@ -19,7 +19,7 @@ public function publish($content): void
             http_response_code($content->getStatusCode());
 
             foreach ($content->getHeaders() as $name => $values) {
-                header($name . ': ' . $content->getHeaderLine($name));
+                @header($name . ': ' . $content->getHeaderLine($name));
             }
 
             fwrite($output, $content->getBody());

tests/Services/HttpPublisherTest.php

@@ -56,4 +56,21 @@ public function test_publish_a_array_response()
 
         $this->assertEquals('["a","b","c"]', ob_get_clean());
     }
+
+    /**
+     * @throws Throwable
+     */
+    public function test_publish_a_standard_response()
+    {
+        ob_start();
+
+        $router = Router::create();
+        $router->get('/', function () {
+            return new JsonResponse(['error' => 'failed'], 400);
+        });
+
+        $router->dispatch();
+
+        $this->assertEquals('{"error":"failed"}', ob_get_clean());
+    }
 }