Add test case

Author: alexbowers

Tests/RequestTest.php

@@ -2427,6 +2427,18 @@ public function testTrustedPort()
 
         $this->assertSame(443, $request->getPort());
     }
+
+    public function testTrustedPortDoesNotDefaultToZero()
+    {
+        Request::setTrustedProxies(['1.1.1.1'], Request::HEADER_X_FORWARDED_ALL);
+
+        $request = Request::create('/');
+        $request->server->set('REMOTE_ADDR', '1.1.1.1');
+        $request->headers->set('X-Forwarded-Host', 'test.example.com');
+        $request->headers->set('X-Forwarded-Port', null);
+
+        $this->assertSame(80, $request->getPort());
+    }
 }
 
 class RequestContentProxy extends Request