Add new performance test checking compute changeset performance.

tests/Doctrine/Tests/ORM/Performance/UnitOfWorkPerformanceTest.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace Doctrine\Tests\ORM\Performance;
+
+require_once __DIR__ . '/../../TestInit.php';
+
+use Doctrine\Tests\Models\CMS\CmsUser;
+
+/**
+ * Description of InsertPerformanceTest
+ *
+ * @author robo
+ */
+class UnitOfWorkPerformanceTest extends \Doctrine\Tests\OrmPerformanceTestCase
+{
+    protected function setUp()
+    {
+        $this->useModelSet('cms');
+        parent::setUp();
+    }
+
+    public function testComputeChanges()
+    {
+        $n = 100;
+
+        $users = array();
+        for ($i=1; $i<=$n; ++$i) {
+            $user = new CmsUser;
+            $user->status = 'user';
+            $user->username = 'user' . $i;
+            $user->name = 'Mr.Smith-' . $i;
+            $this->_em->persist($user);
+            $users[] = $user;
+        }
+        $this->_em->flush();
+
+        
+        foreach ($users AS $user) {
+            $user->status = 'other';
+            $user->username = $user->username . '++';
+            $user->name = str_replace('Mr.', 'Mrs.', $user->name);
+        }
+
+        $s = microtime(true);
+        $this->_em->flush();
+        $e = microtime(true);
+
+        echo ' Compute ChangeSet '.$n.' objects in ' . ($e - $s) . ' seconds' . PHP_EOL;
+    }
+}