add enum support for model property

samples/client/petstore/php/SwaggerClient-php/tests/OrderApiTest.php

@@ -0,0 +1,38 @@
+<?php
+
+require_once('autoload.php');
+
+class OrderApiTest extends \PHPUnit_Framework_TestCase
+{
+
+    // add a new pet (id 10005) to ensure the pet object is available for all the tests
+    public static function setUpBeforeClass() {
+        // for error reporting (need to run with php5.3 to get no warning)
+        //ini_set('display_errors', 1);
+        //error_reporting(~0);
+    }
+  
+    // test get inventory
+    public function testOrder()
+    {
+        // initialize the API client
+        $order = new Swagger\Client\Model\Order();
+  
+        $order->setStatus("placed");
+        $this->assertSame("placed", $order->getStatus());
+    }
+ 
+    /**
+     * @expectedException InvalidArgumentException
+     */ 
+    public function testOrderException()
+    {
+        // initialize the API client
+        $order = new Swagger\Client\Model\Order();
+        $order->setStatus("invalid_value");
+    }
+  
+}
+
+?>
+