diff --git a/samples/client/petstore/php/SwaggerClient-php/tests/ObjectSerializerTest.php b/samples/client/petstore/php/SwaggerClient-php/tests/ObjectSerializerTest.php
new file mode 100644
index 0000000000..14bbc0de91
--- /dev/null
+++ b/samples/client/petstore/php/SwaggerClient-php/tests/ObjectSerializerTest.php
@@ -0,0 +1,29 @@
+<?php
+
+require_once('autoload.php');
+
+// test object serializer
+class ObjectSerializerTest extends \PHPUnit_Framework_TestCase
+{
+    // test sanitizeFilename
+    public function testSanitizeFilename()
+    {
+        // initialize the API client
+        $s = new Swagger\Client\ObjectSerializer();
+
+        $this->assertSame("sun.gif", $s->sanitizeFilename("sun.gif"));
+        $this->assertSame("sun.gif", $s->sanitizeFilename("../sun.gif"));
+        $this->assertSame("sun.gif", $s->sanitizeFilename("/var/tmp/sun.gif"));
+        $this->assertSame("sun.gif", $s->sanitizeFilename("./sun.gif"));
+        
+        $this->assertSame("sun", $s->sanitizeFilename("sun"));
+        $this->assertSame("sun.gif", $s->sanitizeFilename("..\sun.gif"));
+        $this->assertSame("sun.gif", $s->sanitizeFilename("\var\tmp\sun.gif"));
+        $this->assertSame("sun.gif", $s->sanitizeFilename("c:\var\tmp\sun.gif"));
+        $this->assertSame("sun.gif", $s->sanitizeFilename(".\sun.gif"));
+    }
+  
+}
+
+?>
+