Ensures objects implementing __toString() are serialized correctly …

…by XmlRenderer

test/Renderer/XmlRendererTest.php

@@ -9,9 +9,11 @@
 
 use DateTime;
 use PHPUnit\Framework\TestCase;
+use stdClass;
 use Zend\Expressive\Hal\HalResource;
 use Zend\Expressive\Hal\Link;
 use Zend\Expressive\Hal\Renderer\XmlRenderer;
+use ZendTest\Expressive\Hal\TestAsset\StringSerializable;
 
 class XmlRendererTest extends TestCase
 {
@@ -80,4 +82,18 @@ public function testCanRenderPhpDateTimeInstances()
         $xml = $renderer->render($resource);
         $this->assertContains($dateTime->format('c'), $xml);
     }
+
+    public function testCanRenderObjectsThatImplementToString()
+    {
+        $instance = new StringSerializable();
+
+        $resource = new HalResource([
+            'key' => $instance,
+        ]);
+        $resource = $resource->withLink(new Link('self', '/example'));
+
+        $renderer = new XmlRenderer();
+        $xml = $renderer->render($resource);
+        $this->assertContains((string) $instance, $xml);
+    }
 }

test/TestAsset/StringSerializable.php

@@ -0,0 +1,18 @@
+<?php
+/**
+ * @see       https://github.com/zendframework/zend-expressive-hal for the canonical source repository
+ * @copyright Copyright (c) 2017 Zend Technologies USA Inc. (https://www.zend.com)
+ * @license   https://github.com/zendframework/zend-expressive-hal/blob/master/LICENSE.md New BSD License
+ */
+
+declare(strict_types=1);
+
+namespace ZendTest\Expressive\Hal\TestAsset;
+
+class StringSerializable
+{
+    public function __toString()
+    {
+        return __METHOD__;
+    }
+}